Answers (3)
Teeth do not have blood circulation like the rest of the body, they absorb nutrients from saliva through the surfaces. So you want to keep the surface clean.
Another problem is that bacteria can produce acid, which dissolves the calcium in teeth. Brushing knocks the bacteria off.
Dentists all insist that it's brushing that does the job, not any kind of toothpaste or mouthwash.
BTW brushing teeth has nothing to do with bad breath. You might have tonsil stones, but in most cases your breath smells like your blood. If that's bad then you need a change of diet to clean up your blood.
Teeth cannot repair themselves like the rest of our body can, so they need a little push in the right direction to stay healthy.
Literally everything we eat has acid, and that wears down enamel, so we have to clean that away, or our teeth become paper thin and lose their shine.
Also, everything we eat has some form of sugar and starch in it, which sticks to teeth, eventually forming bacteria that eats away at the structure of the tooth.
I made a terrible mistake of not brushing my teeth very often between the ages of 9-17 (due to severe depression), and I'm paying for it now in terms of pain and anxiety. I also clench my teeth at night, so all of my teeth feel loose all the time.
When you eat, some foods stick to crevices, grooves, pits and spaces between the teeth and gums. If you do not brush it, rinse it, clean it up, bacteria will act on those foods which are stick and yields acid that can be destroyed the teeth. Also it leads to bleeding or losing the tooth. So brushing at least 2 times or at max 3 times daily and cleaning carefully especially after having your dinner.