2. The Digestive System

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Humans have 2 sets of teeth in their life time: milk teeth (there are 20, they appear with 6 months and fall down with 6 years) and adult or permanent teeth (there are 32).
There are different types of teeth depending on their functions: molars (at the back for chewing), premolars (for crushing food),     canines (for tearing food) and incisors (8, for biting and cutting food).

Resultado de imagen de teeth molars premolars canine incisors