Question

we must brush our teeth first time in the morning and then before going to bed why?​

Answer 1

Explanation:

If we don't brush our teeth,pH value of teeth goes less than 5.5,then tooth decay (cavity) would form.So,we mush brush our teeth twice daily.

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Answer 2

Answer:

If we don't brush our ph level decreased

But there is are some bacteria which literally can melt our teeth