How often do you replace your toothbrush?

Every 3 months unless you get sick, then right after you feel better so you do not continue to re-infect yourself.

Minimum every 6 months..

Nurse A

recommendations are every 12 weeks or so but it also depends how hard and what type of brush you have/use.

if the bristles start to go flattened or ragged (splayed out) then it is time to consider a new one. do note flossing as as important too.

every 3 months

every 3 months is what the dentist recommends

I change mine every month