What parts of the tooth are secreted from mammalian teeth? How are their teeth differentiated and what are the functions

What parts of the tooth are secreted from mammalian teeth? How are their teeth differentiated and what are the functions of different types of teeth in mammals?

1) crown, neck and root of the tooth
2) mammalian teeth are differentiated into incisors, canines and molars
3) incisors are necessary for biting off food, canines – for tearing, and root – for grinding and chewing

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