Why does sweet food give us toothache?

Hi,
Sweet food causes our teeth to decay and makes us fat too.
As I know, in Singapore, pupils are not allowed to drink coke.
Maybe they think when one is fat, one becomes stupid or something.
Our bodies do need sugar, but we just cannot have too much of it.
I want to be healthy and I love my teeth.
I will eat less sweet food for sure.


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