[National Library of Medicine HF1263 This transfer made: 03/31/06 Length: 00:14:32]

[Made in co-operation with the Department of Biology and Public Health, Massachusetts Institute of Technology]

[Directed by the Rochester Dental Dispensary and approved by the American Dental Association]

[Girl shown with big smile]

[Teeth are made from food we eat]

[Girl shown sitting at table with plates of food and a glass of milk]

[Girl cuts up food and eats]

[A diagram shows the parts of a tooth]

[Diagram of a tooth with a pointer showing where the enamel is located]

[Enamel Inorganic Material]

[Diagram of a tooth with a pointer showing where the Cementum is located]

[Cementum - Bone Like 2/3 Inorganic 1/3 Organic]

[Diagram of a tooth with a pointer showing where the Dentine is located]

[Dentine 2/3 Inorganic 1/3 Organic]

[Diagram of a tooth with a pointer showing where the Dental Pulp is located]

[Dental Pulp Entirely Organic]

[Right foods are necessary for good teeth]

[Girl is shown sitting at table eating and drinking]

[Vigorous chewing helps to make strong teeth]

[Girl is shown sitting at a table with a plate of fruit. She chooses an apple and bites into it. Close up of the girl chewing.]

[Stain and deposits lead to decay]

[Extreme close up of a mouth with lips pulled back. Teeth are stained and unclean.]

[The mouth opens and closes]

[The dental hygienist helps to keep the mouth healthy]

[A woman is shown welcoming a young boy to a dental chair]

[The boy sits down and the woman puts a dental bib on him]

[The woman pulls a tray of dental tools towards her]

[The woman looks at the boys teeth with a dental mirror]

[The woman rubs the boy's gums with a solution]

[The woman paints the boy's teeth with a dark solution]

[Close up of the boy's mouth as solution is being applied]

[The woman scraps the boy's teeth with a dental tool]

[Close up of boy's mouth while the woman scrapes his teeth]

[The woman polishes a front tooth]

[The woman uses a mirror to see the back of the boy's teeth]

[Close up of the boy's mouth as a dark solution is painted on the back of his teeth]

[Close up of the woman scraping the back of the boy's teeth with a dental tool]

[The woman gives the boy a demonstration of the correct way to brush teeth using a hand held model]

[The hygienist shows how to brush the teeth thoroughly]

[Close up of the woman showing the correct way to brush teeth using herself as a model]

[Decay usually starts in places hard to keep clean]

[Diagram of teeth with a pointer indicating the starting points of decay]

[Starting Points of Decay]

[Pointer shows areas where decay can start. Points to the flat part of molars. Points next at areas between teeth where they touch.]

[Diagram of one tooth}

[Starting point of decay]

[Pointer again points to flat part of molar.]

[Animation shows cavity developing and spreading through the enamel]

[Spreads along dento-enamel junction]

[Animation shows cavity spreading through dental pulp]

[Points toward dental pulp]

[The dentist can repair decayed teeth]

[A male dentist is shown in an office with a young girl sitting in a dental chair]

[The dentist wipes his hands and then picks up a dental instrument]

[The dentist is working in her mouth with tools]

[Close up of the girl's mouth as the dentist uses a dental tool on her teeth]

[Close up of the dentist drilling out a cavity]

[A solution is sprayed on the tooth]

[A piece of cotton is used to clean out the tooth]

[The dentist fills the tooth]

[A decayed tooth not repaired in time dies and an abscess may form at the root]

[A diagram of teeth is shown with the label 1st stage of decay]

[A pointer shows the first stage of decay]

[A pointer shows the second stage of decay with label 2nd stage of decay]

[A pointer shows the third stage of decay with the label 3rd stage of decay]

[A pointer shows a big cavity with the label 4th stage of decay]

[Close up of a mouth with a dental mirror showing a big cavity]

[A diagram shows what happens to a tooth if it is not repaired]

[An animated diagram shows a tooth as the cavity gets bigger and bigger]

[Spread of decay into pulp causes death of tooth]

[Animation shows the spread of decay through the roots]

[Infection spreads through apex]

[An abscess is formed]

[Diagram changes to another diagram again showing that an abscess is formed]

[Incorrect breathing and the habit of finger sucking cause narrow dental arches]

[Two young girls are shown looking at a magazine]

[One girl is shown sucking on her finger]

[The dentist's mirror shows how the upper teeth have grown outward]

[Close up of a mouth with a mirror showing how the upper teeth are pulled forward]

[Some teeth are poorly developed because of childhood diseases]

[Close up of mouth with poorly developed teeth]

[Close up of mouth with spaces between front teeth both on the top and the bottom]

[Crooked teeth can be straightened]

[Close up of crooked teeth]

[Close up of mouth with braces on the teeth]

[Close up of mouth with straight teeth]

[Home care of the teeth is very important]

[A girl is shown in a bathroom brushing her teeth]

[The girl brushes her teeth and tongue]

[Dental floss is used with care not to injure the gums]

[The girl is shown flossing her teeth]

[The girl rinses her mouth]