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Hard projections in the mouths of vertebrates used mainly to mechanically digest food. Teeth can also be used for the purposes of defense or obtaining meals, especially in the case of hunting.

12 votes
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How is the fluoride in toothpaste absorbed?

How is the fluoride in toothpaste absorbed by our body? Does the tooth absorb the molecule directly, or is it absorbed by the mouth? The answers to this question suggest that some materials can be ab …
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