TEETH I & II - TEETH I-$60 billion/year(US spent-20...

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TEETH I - $60 billion./year (US) spent -20 primary teeth, 32 permanent ones -humans switch teet twice in a lifetime ( diphyodont) , whereas sharks grow new teeth every two weeks( polyphyodont ) - No natural permanent teeth at age 65 + (US) : 1997 – 30%, Today – 24%. In Canada, today its 22% A) Dental Diseases: a) Tooth Decay (cavities) (Early in life) : Van Leewenhoeck (1683) : one of the first people to develop a microscope. Found life in his mouth and in nature called them “ animalcules ”. Was first one to realize that there are living species in our mouth. -600 different species in our mouth -more bacteria in our mouth than humans on the planet. -* S mutans : produce lactic acid when fed carbs and sugar. Plaque = S mutans + glucans (their byproduct, which has the ability to stick to the teeth which are otherwise very slippery. This is what they hold on to.) Hydroxy Apatite (enamel) in solid form is in equilibrium with its dissolved form along with OH - . This OH reacts with the H + from the lactic acid to produce H 2 O, thus because OH is being used up, the equilibrium shifts towards the right, creating more dissolved form of hydroxyl apatite, creating a cavity. -Today, a lot less cavities are being filled, compared to 1980s. Mostly b/c of fluoride. (1980--200 million, today--<75 million).
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