Answer:
While you sleep bacteria trend to multiply so any bacteria that may be lingering can cause problems then it helps protect your teeth throughout the day by strengthening the enamel before you eat
A, B AB and O, O being the most useful, because O blood can be given to everyone, but also the most selective, since they can only receive O blood
It builds and repairs tissues.
1. Sex education
2. Chaperones.
3. Parents actually taking care of kids.
4. Having a 1v1 conversation.