What is the role of saliva in the digestion of food?

Explanation

Saliva is a fluid which is secreted by the salivary glands. It helps in digestion of food by following ways.
1) Salivba contains a digestice enzyme called salivary amylase, which converts
Starch `overset("Amylase")to` glucose
2) It cleans the mouth cavity and tends to destroy germs that cause teeth decay. It contains lysozomes which help in destroying the bacteria.
3) It moistens and lubricates food which again helps in swallowing.
4) Each year photosynthesis synthesizes approximately 160 billion metric tonnes of carbohydrates.