How exactly does sugar cause tooth decay?

lack of real nutrition does it, if you don't  believe me look up ' Nutrition and Physical Degeneration by Weston Price ' it's online in PDF form and will tell you wayyyyyyyy more than anyone else will tell you

and read it yourself, it is complete with pictures as proof of claim and lots of text too.....real Nutritionist go to School for 4 yrs to get their degree. Doctors only get 2weeks of nutrition compared to 4yrs that a Nutritionist gets.....you decide !

hahaha, coz, hahahaah it just,, hahaha it does, haha

but how?

hahaha.. its... haha .. its just ha, really bad 

in what way?

hahaha, its just the... haha, its just bad man okay?

whats in it?

hahaha, its just.. haha just ha, lots of bad things

name one

hahaha, just... haha, its just the sugar, hahaha.