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A toothbrush is an
oral hygiene Oral hygiene is the practice of keeping one's mouth clean and free of disease and other problems (e.g. bad breath) by regular brushing of the teeth (dental hygiene) and cleaning between the teeth. It is important that oral hygiene be carried out ...
tool used to clean the
teeth A tooth ( : teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, t ...
,
gums The gums or gingiva (plural: ''gingivae'') consist of the mucosal tissue that lies over the mandible and maxilla inside the mouth. Gum health and disease can have an effect on general health. Structure The gums are part of the soft tissue lin ...
, and
tongue The tongue is a muscular organ in the mouth of a typical tetrapod. It manipulates food for mastication and swallowing as part of the digestive process, and is the primary organ of taste. The tongue's upper surface (dorsum) is covered by taste ...
. It consists of a head of tightly clustered
bristle A bristle is a stiff hair or feather (natural or artificial), either on an animal, such as a pig, a plant, or on a tool such as a brush or broom. Synthetic types Synthetic materials such as nylon are also used to make bristles in items such as ...
s, atop of which
toothpaste Toothpaste is a paste or gel dentifrice used with a toothbrush to clean and maintain the aesthetics and health of teeth. Toothpaste is used to promote oral hygiene: it is an abrasive that aids in removing dental plaque and food from the teeth, ...
can be applied, mounted on a
handle A handle is a part of, or attachment to, an object that allows it to be grasped and manipulated by hand. The design of each type of handle involves substantial ergonomic issues, even where these are dealt with intuitively or by following tr ...
which facilitates the cleaning of hard-to-reach areas of the mouth. They should be used in conjunction with something to clean between the teeth where the bristles of the toothbrush cannot reach - for example
floss Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...
, tape or interdental brushes. They are available with different bristle textures, sizes, and forms. Most dentists recommend using a soft toothbrush since hard-bristled toothbrushes can damage
tooth enamel Tooth enamel is one of the four major tissues that make up the tooth in humans and many other animals, including some species of fish. It makes up the normally visible part of the tooth, covering the crown. The other major tissues are dentin, ...
and irritate the gums. Because many common and effective ingredients in toothpaste are harmful if swallowed in large doses and instead should be spat out, the act of brushing teeth is most often done at a
sink A sink is a bowl-shaped plumbing fixture for washing hands, dishwashing, and other purposes. Sinks have a tap (faucet) that supply hot and cold water and may include a spray feature to be used for faster rinsing. They also include a drain t ...
within the kitchen or bathroom, where the brush may be rinsed off afterwards to remove any debris remaining and then dried to reduce conditions ideal for germ growth (and, if it is a
wood Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin ...
en toothbrush,
mold A mold () or mould () is one of the structures certain fungi can form. The dust-like, colored appearance of molds is due to the formation of spores containing fungal secondary metabolites. The spores are the dispersal units of the fungi. Not ...
as well). Some toothbrushes have plant-based handles, often
bamboo Bamboos are a diverse group of evergreen perennial flowering plants making up the subfamily Bambusoideae of the grass family Poaceae. Giant bamboos are the largest members of the grass family. The origin of the word "bamboo" is uncertain, ...
. However, numerous others are made of cheap
plastic Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...
; such brushes constitute a significant source of pollution. Over 1 billion toothbrushes are disposed of into landfills annually in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
alone. Bristles are commonly made of
nylon Nylon is a generic designation for a family of synthetic polymers composed of polyamides ( repeating units linked by amide links).The polyamides may be aliphatic or semi-aromatic. Nylon is a silk-like thermoplastic, generally made from pe ...
(which, while not biodegradable, as plastic is, may still be
recycle Recycling is the process of converting waste materials into new materials and objects. The recovery of energy from waste materials is often included in this concept. The recyclability of a material depends on its ability to reacquire the p ...
d) or
bamboo viscose Bamboo textile is any cloth, yarn or clothing made from bamboo fibres. While historically used only for structural elements, such as bustles and the ribs of corsets, in recent years different technologies have been developed that allow bamboo fib ...
.


History


Precursors

Before the invention of the toothbrush, a variety of
oral hygiene Oral hygiene is the practice of keeping one's mouth clean and free of disease and other problems (e.g. bad breath) by regular brushing of the teeth (dental hygiene) and cleaning between the teeth. It is important that oral hygiene be carried out ...
measures had been used. This has been verified by excavations during which tree
twig A twig is a thin, often short, branch of a tree or bush. The buds on the twig are an important diagnostic characteristic, as are the abscission scars where the leaves have fallen away. The color, texture, and patterning of the twig bark ar ...
s, bird feathers, animal
bone A bone is a rigid organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the various other organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body, ...
s and porcupine quills were recovered. The predecessor of the toothbrush is the
chew stick A teeth-cleaning twig (in India: ''datun'') is an oral hygiene tool made from a twig from a tree. It can help to prevent tooth decay and gum disease. History Chew sticks are twigs or roots of certain plants that are chewed until one end is fra ...
. Chew sticks were twigs with frayed ends used to brush the teeth while the other end was used as a toothpick. The earliest chew sticks were discovered in Sumer in southern
Mesopotamia Mesopotamia ''Mesopotamíā''; ar, بِلَاد ٱلرَّافِدَيْن or ; syc, ܐܪܡ ܢܗܪ̈ܝܢ, or , ) is a historical region of Western Asia situated within the Tigris–Euphrates river system, in the northern part of the ...
in 3500 BC, an Egyptian tomb dating from 3000 BC, and mentioned in Chinese records dating from 1600 BC. The Indian way of using tooth wood for brushing is presented by the Chinese Monk
Yijing The ''I Ching'' or ''Yi Jing'' (, ), usually translated ''Book of Changes'' or ''Classic of Changes'', is an ancient Chinese divination text that is among the oldest of the Chinese classics. Originally a divination manual in the Western Zho ...
(635–713 CE) when he describes the rules for Monks in his book: "Every day in the morning, a monk must chew a piece of tooth wood to brush his teeth and scrape his tongue, and this must be done in the proper way. Only after one has washed one’s hands and mouth may one make salutations. Otherwise both the saluter and the saluted are at fault. In Sanskrit, the tooth wood is known as the dantakastha—danta meaning tooth, and kastha, a piece of wood. It is twelve finger-widths in length. The shortest is not less than eight finger-widths long, resembling the little finger in size. Chew one end of the wood well for a long while and then brush the teeth with it." The Greeks and Romans used toothpicks to clean their teeth, and toothpick-like twigs have been excavated in
Qin Dynasty The Qin dynasty ( ; zh, c=秦朝, p=Qín cháo, w=), or Ch'in dynasty in Wade–Giles romanization ( zh, c=, p=, w=Ch'in ch'ao), was the first dynasty of Imperial China. Named for its heartland in Qin state (modern Gansu and Shaanxi), ...
tombs. Chew sticks remain common in Africa, the rural Southern United States, and in the Islamic world the use of chewing stick
miswak The miswak (''miswaak'', ''siwak'', ''sewak'', ar, سواك or ) is a teeth-cleaning twig made from the ''Salvadora persica'' tree (known as ''arāk'', أراك, in Arabic). It is reputed to have been used over 7,000 years ago. The miswak's p ...
is considered a pious action and has been prescribed to be used before every prayer five times a day.IslamKotob, ''Muslims and Science'', (Islamic Books), p.30. Miswaks have been used by Muslims since the 7th century. Twigs of
Neem ''Azadirachta indica'', commonly known as neem, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae. It is one of two species in the genus '' Azadirachta'', and is native to the Indian subcontinent and most of the countries in Afr ...
Tree have been used by ancient Indians. Neem, in its full bloom, can aid in healing by keeping the area clean and disinfected. In fact, even today, Neem twigs called '' datun'' are used for brushing teeth in India, although not hugely common.


Toothbrush

The first
bristle A bristle is a stiff hair or feather (natural or artificial), either on an animal, such as a pig, a plant, or on a tool such as a brush or broom. Synthetic types Synthetic materials such as nylon are also used to make bristles in items such as ...
toothbrush resembling the modern one was found in China. Used during the
Tang Dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...
(619–907), it consisted of hog bristles. The bristles were sourced from hogs living in Siberia and northern China because the colder temperatures provided firmer bristles. They were attached to a handle manufactured from bamboo or bone, forming a toothbrush. In 1223, Japanese
Zen Zen ( zh, t=禪, p=Chán; ja, text= 禅, translit=zen; ko, text=선, translit=Seon; vi, text=Thiền) is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School (''Chánzong'' 禪宗), and ...
master
Dōgen Dōgen Zenji (道元禅師; 26 January 1200 – 22 September 1253), also known as Dōgen Kigen (道元希玄), Eihei Dōgen (永平道元), Kōso Jōyō Daishi (高祖承陽大師), or Busshō Dentō Kokushi (仏性伝東国師), was a J ...
Kigen recorded in his ''
Shōbōgenzō is the title most commonly used to refer to the collection of works written in Japan by the 13th century Buddhist monk and founder of the Sōtō Zen school, Eihei Dōgen. Several other works exist with the same title (see above), and it is som ...
'' that he saw monks in China clean their teeth with brushes made of horsetail hairs attached to an oxbone handle. The bristle toothbrush spread to Europe, brought from China to Europe by travellers. It was adopted in Europe during the 17th century. The earliest identified use of the word toothbrush in English was in the autobiography of Anthony Wood who wrote in 1690 that he had bought a toothbrush from J. Barret. Europeans found the hog bristle toothbrushes imported from China too firm and preferred softer bristle toothbrushes made from horsehair. Mass-produced toothbrushes made with horse or boar bristle continued to be imported to Britain from China until the mid 20th century. In the UK, William Addis is believed to have produced the first mass-produced toothbrush in 1780. In 1770, he had been jailed for causing a riot. While in prison he decided that using a
rag Rag, rags, RAG or The Rag may refer to: Common uses * Rag, a piece of old cloth * Rags, tattered clothes * Rag (newspaper), a publication engaging in tabloid journalism * Rag paper, or cotton paper Arts and entertainment Film * ''Rags'' (1915 ...
with
soot Soot ( ) is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons. It is more properly restricted to the product of the gas-phase combustion process but is commonly extended to include the residual pyrolysed ...
and
salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quant ...
on the teeth was ineffective and could be improved. After saving a small
bone A bone is a rigid organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the various other organs of the body, produce red and white blood cells, store minerals, provide structure and support for the body, ...
from a meal, he drilled small holes into the bone and tied into the bone tufts of bristles that he had obtained from one of the guards, passed the tufts of bristle through the holes in the bone and sealed the holes with glue. After his release, he became wealthy after starting a business manufacturing toothbrushes. He died in 1808, bequeathing the business to his eldest son. It remained within family ownership until 1996. Under the name Wisdom Toothbrushes, the company now manufactures 70 million toothbrushes per year in the UK. By 1840 toothbrushes were being mass-produced in Britain, France, Germany, and Japan. Pig bristles were used for cheaper toothbrushes and badger hair for the more expensive ones.
Hertford Museum Hertford Museum is a local museum in Hertford, the county town of Hertfordshire, England.Hertford Museum
...
in Hertford, UK, holds approximately 5000 brushes that make up part of the Addis Collection. The Addis factory on Ware Road was a major employer in the town until 1996. Since the closure of the factory, Hertford Museum has received photographs and documents relating to the archive, and collected oral histories from former employees. The first
patent A patent is a type of intellectual property that gives its owner the legal right to exclude others from making, using, or selling an invention for a limited period of time in exchange for publishing an enabling disclosure of the invention."A ...
for a toothbrush was granted to H.N. Wadsworth in 1857 (U.S.A. Patent No. 18,653) in the United States, but mass production in the United States did not start until 1885. The improved design had a bone handle with holes bored into it for the Siberian
boar The wild boar (''Sus scrofa''), also known as the wild swine, common wild pig, Eurasian wild pig, or simply wild pig, is a suid native to much of Eurasia and North Africa, and has been introduced to the Americas and Oceania. The species is ...
hair bristles. Unfortunately, animal bristle was not an ideal material as it retained
bacteria Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one Cell (biology), biological cell. They constitute a large domain (biology), domain of prokaryotic microorganisms. Typically a few micrometr ...
, did not dry efficiently and the bristles often fell out. In addition to bone, handles were made of wood or ivory. In the United States, brushing teeth did not become routine until after
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...
, when American soldiers had to clean their teeth daily. During the 1900s, celluloid gradually replaced bone handles. Natural animal bristles were also replaced by synthetic fibers, usually
nylon Nylon is a generic designation for a family of synthetic polymers composed of polyamides ( repeating units linked by amide links).The polyamides may be aliphatic or semi-aromatic. Nylon is a silk-like thermoplastic, generally made from pe ...
, by DuPont in 1938. The first nylon bristle toothbrush made with nylon yarn went on sale on February 24, 1938. The first electric toothbrush, the Broxodent, was invented in Switzerland in 1954. By the turn of the 21st century nylon had come to be widely used for the bristles and the handles were usually molded from
thermoplastic A thermoplastic, or thermosoft plastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling. Most thermoplastics have a high molecular weight. The polymer chains associate ...
materials. Johnson & Johnson, a leading medical supplies firm, introduced the " Reach" toothbrush in 1977. It differed from previous toothbrushes in three ways: it had an angled head, similar to dental instruments, to reach back teeth; the bristles were concentrated more closely than usual to clean each tooth of potentially cariogenic (cavity-causing) materials; and the outer bristles were longer and softer than the inner bristles. Other manufacturers soon followed with other designs aimed at improving effectiveness. In spite of the changes with the number of tufts and the spacing, the handle form and design, the bristles were still straight and difficult to maneuver. In 1978 Dr. George C. Collis developed the Collis Curve toothbrush which was the first toothbrush to have curved bristles. The curved bristles follow the curvature of the teeth and safely reach in between the teeth and into the sulcular areas. In January 2003, the toothbrush was selected as the number one invention
Americans Americans are the citizens and nationals of the United States of America.; ; Although direct citizens and nationals make up the majority of Americans, many dual citizens, expatriates, and permanent residents could also legally claim Ame ...
could not live without according to the Lemelson-
MIT The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the m ...
Invention Index.


Types of toothbrush


Multi-sided toothbrushes

A multi-sided toothbrush is a fast and easy way to brush the teeth.


Electric toothbrush

It has been discovered that compared to a manual brush, the multi-directional power brush might reduce the incidence of gingivitis and plaque, when compared to regular side-to-side brushing. These brushes tend to be more costly and damaging to the environment when compared to manual toothbrushes. Most studies report performances equivalent to those of manual brushings, possibly with a decrease in plaque and gingivitis. An additional timer and pressure sensors can encourage a more efficient cleaning process. Electric toothbrushes can be classified, according to the speed of their movements as: standard power toothbrushes, sonic toothbrushes, or
ultrasonic toothbrush An ultrasonic toothbrush is an electric toothbrush designed for daily home use that operates by generating ultrasound in order to aid in removing Dental plaque, plaque and rendering plaque bacteria harmless. It typically operates on a frequency of ...
es. Any electric toothbrush is technically a powered toothbrush. If the motion of the toothbrush is sufficiently rapid to produce a hum in the
audible frequency An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. The generally accepted ...
range (20 Hz to 20,000 Hz), it can be classified as a sonic toothbrush. Any electric toothbrush with movement faster than this limit can be classified as an ultrasonic toothbrush. Certain ultrasonic toothbrushes, such as the Megasonex and the Ultreo, have both sonic and ultrasonic movements. There are different electric toothbrush heads designed for sensitive teeth and gums, increased stain removal, or different-sized bristles for tight or gapped teeth. The hand motion with an electric toothbrush is different than a manual toothbrush. They are meant to have the bristles do the work by just placing and moving the toothbrush. Fewer back and forth strokes are needed.


Interdental brush

An interdental or interproximal ("proxy") brush is a small brush, typically disposable, either supplied with a reusable angled plastic handle or an integral handle, used for cleaning between
teeth A tooth ( : teeth) is a hard, calcified structure found in the jaws (or mouths) of many vertebrates and used to break down food. Some animals, particularly carnivores and omnivores, also use teeth to help with capturing or wounding prey, t ...
and between the wires of
dental brace Dental may refer to: * Dental consonant, in phonetics * Dental Records, an independent UK record label * Dentistry, oral medicine * Teeth See also * * Dental care (disambiguation) * Dentist (disambiguation) * Tooth (disambiguation) A tooth (pl ...
s and the teeth. The use of interdental brushes in conjunction with tooth brushing has been shown to reduce both the amount of plaque and the incidence of gingivitis when compared to tooth brushing alone. Although there is some evidence that after tooth brushing with a conventional tooth brush, interdental brushes remove more plaque than
dental floss Dental floss is a cord of thin filaments used in interdental cleaning to remove food and dental plaque from between teeth or places a toothbrush has difficulty reaching or is unable to reach. Its regular use as part of oral cleaning is designed ...
, a systematic review reported insufficient evidence to determine such an association. The size of interdental brushes is standardized in
ISO ISO is the most common abbreviation for the International Organization for Standardization. ISO or Iso may also refer to: Business and finance * Iso (supermarket), a chain of Danish supermarkets incorporated into the SuperBest chain in 2007 * Iso ...
16409.ISO 16409:2006 + Amd.1:2010, ''Dentistry – Oral hygiene products – Manual interdental brushes''ISO/ DIS 16409:2014, ''Dentistry – Oral hygiene products – Manual interdental brushes'' (draft standard) The brush size, which is a number between 0 (small space between teeth) and 8 (large space), indicates the ''passage hole diameter''. This corresponds to the space between two teeth that is just sufficient for the brush to go through without bending the wire. The color of the brushes differs between producers. The same is the case with respect to the wire diameter.


End-tuft brush

The small round brush head comprises seven tufts of tightly packed soft nylon bristles, trimmed so the bristles in the center can reach deeper into small spaces. The brush handle is ergonomically designed for a firm grip, giving the control and precision necessary to clean where most other cleaning aids cannot reach. These areas include the posterior of the wisdom teeth (third molars), orthodontic structures (braces), crowded teeth, and tooth surfaces that are next to missing teeth. It can also be used to clean areas around implants, bridges, dentures and other appliances.


Chewable toothbrush

A chewable toothbrush is a miniature plastic moulded toothbrush which can be placed inside the mouth. While not commonly used, they are useful to travelers and are sometimes available from
bathroom A bathroom or washroom is a room, typically in a home or other residential building, that contains either a bathtub or a shower (or both). The inclusion of a wash basin is common. In some parts of the world e.g. India, a toilet is typically ...
vending machine A vending machine is an automated machine that provides items such as snacks, beverages, cigarettes, and lottery tickets to consumers after cash, a credit card, or other forms of payment are inserted into the machine or otherwise made. The ...
s. They are available in different flavors such as mint or bubblegum and should be disposed of after use. Other types of disposable toothbrushes include those that contain a small breakable plastic ball of
toothpaste Toothpaste is a paste or gel dentifrice used with a toothbrush to clean and maintain the aesthetics and health of teeth. Toothpaste is used to promote oral hygiene: it is an abrasive that aids in removing dental plaque and food from the teeth, ...
on the bristles, which can be used without water.


Musical toothbrush

A musical toothbrush is a type of manual or powered toothbrush designed to make tooth brushing habit more interesting. It is more commonly introduced to children to gain their attention and positively influence their tooth brushing behavior. The music starts while child starts brushing, it continuously plays during the brushing and it ends when the child stops brushing.


Toothpaste-less toothbrush


Reusable toothbrush


Tooth brushing


Hygiene and care

It is not recommended to share toothbrushes with others, since besides general hygienic concerns, there is a risk of transmitting diseases that are typically transmittable by blood, such as Hepatitis C. After use, it is advisable to rinse the toothbrush with water, shake it off and let the toothbrush dry. Studies have shown that brushing to remove
dental plaque Dental plaque is a biofilm of microorganisms (mostly bacteria, but also fungi) that grows on surfaces within the mouth. It is a sticky colorless deposit at first, but when it forms tartar, it is often brown or pale yellow. It is commonly found be ...
more often than every 48 hours is enough to maintain gum and tooth health. Tooth brushing can remove plaque up to one millimeter below the gum line, and each person has a habitual brushing method, so more frequent brushing does not cover additional parts of the teeth or mouth. Most dentists recommended patients brush twice a day in the hope that more frequent brushing would clean more areas of the mouth. Tooth brushing is the most common
preventive healthcare Preventive healthcare, or prophylaxis, consists of measures taken for the purposes of disease prevention.Hugh R. Leavell and E. Gurney Clark as "the science and art of preventing disease, prolonging life, and promoting physical and mental hea ...
activity, but tooth and gum disease remain high, since lay people clean at most 40% of their tooth margins at the gum line. Videos show that even when asked to brush their best, they do not know how to clean effectively.


Adversity of toothbrushes

Teeth can be damaged by several factors including poor oral hygiene, but also by wrong oral hygiene. Especially for sensitive teeth, damage to dentin and gums can be prevented by several measures including a correct brushing technique. It is beneficial, when using a straight bristled brush, not to scrub horizontally over the necks of teeth, not to press the brush too hard against the teeth, to choose a toothpaste that is not too abrasive, and to wait at least 30 minutes after consumption of acidic food or drinks before brushing. Harder toothbrushes reduce plaque more efficiently but are more stressful to teeth and gum; using a medium to soft brush for a longer cleaning time was rated to be the best compromise between cleaning result and gum and tooth health. A study by
University College London , mottoeng = Let all come who by merit deserve the most reward , established = , type = Public research university , endowment = £143 million (2020) , budget = ...
found that advice on brushing technique and frequency given by 10 national dental associations, toothpaste and toothbrush companies, and in dental textbooks was inconsistent.


See also

*
Dental floss Dental floss is a cord of thin filaments used in interdental cleaning to remove food and dental plaque from between teeth or places a toothbrush has difficulty reaching or is unable to reach. Its regular use as part of oral cleaning is designed ...
*
Mouthwash Mouthwash, mouth rinse, oral rinse, or mouth bath is a liquid which is held in the mouth passively or swilled around the mouth by contraction of the perioral muscles and/or movement of the head, and may be gargled, where the head is tilted back ...
*
Toothbrush moustache The toothbrush moustache is a style of moustache in which the sides are vertical (or nearly vertical) rather than tapered, giving the hairs the appearance of the bristles on a toothbrush that are attached to the nose. It was made famous by such ...


References


External links

*
American Dental Association statements on Tooth brushingBBC h2g2 The History of Toothpaste and Toothbrushes
{{Authority control Dental equipment Domestic implements English inventions Oral hygiene Ancient inventions