Question

health class test
how often should teeth be brushed?
a) once a week
b) twice a day
c) twice a week
d) after lasting

Explanation:

In dental health and general health guidelines, the recommended frequency for brushing teeth is twice a day (morning and evening, or after main meals) to maintain oral hygiene, prevent cavities, and gum diseases. Options like once a week or twice a week are too infrequent, and "after lasting" is unclear or incorrect. So the correct option is the one stating twice a day.

Answer:

b) Twice a day