Tooth decay is caused by the acids produced when bacteria that live in your mouth digest sugars and starches. This acid eats away at the enamel of the teeth. There are several dental risk assessment...
You should brush your teeth because it will take all the germs out from your morning breath and after eating. If you don't you will have tooth pain until you brush your teeth.
It reduces the acidity or PH level in the mouth and around the teeth. This is especially important and useful for people who consume more acidic foods and drinks such as orange juice.