The duties of the spit.
1. help the food easier to swallow.
2. control the amount of water in the body.
3. functions the digestion of carbohydrate types
4. acts destroy food, taste buds (tast bud) taste
helped cleaning the mouth and teeth.
5. the movement of the tongue while speaking.
6. the substance of some kind (excretory) include urea, sugar, each toxic substance such as mercury (Hg), lead (Pb).