For how many years are primary teeth needed for

chewing, appearance, and

speech?

Explanation:

from birth – clean your baby’s mouth and gums by wiping with a soft cloth

first tooth – brush twice a day with a soft toothbrush and plain water

12 months – take your child for their first dental visit

18 months – add a pea-sized amount of low fluoride or children’s toothpaste to the brush, and encourage your child to spit out the toothpaste (and not swallow or rinse)

two and a half years – begin flossing between any teeth that touch

four to five years – start teaching your child to brush their own teeth

six years – switch to adult toothpaste and continue to encourage your child to spit it out and not rinse. Start teaching your child to floss their own teeth

eight years – allow your child to brush and floss unsupervised. Continue regular dental check-ups.

answer(b) keep oxygenated and deoxygenated blood separate;