The Teeth
In the adult there are up to 32 teeth, which are different in shape and function. From the front backwards there are incisors, canines, premolars and molars. The incisors and canines are used to cut the food, while the others grind it to aid digestion.
The Tongue
At the back of the tongue there are some swellings which consist of lymphoid tissue. Underneath the tongue there is a midline attachment - the frenulum - and the opening of some of the salivary ducts. There are other salivary glands - the parotid glands - which lie over the angle of the jaw and have a duct that opens into the inside of the cheek at about the level of the second molar tooth.
Swallowing Food
Swallowing food is initiated by the tip of the tongue pressing against the roof of the mouth and contracting from the front backwards, pushing the bolus of food back towards the throat. As the food reaches the back of the tongue the process of swallowing becomes automatic.
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