The American Dental Association doesn't state that you should change your toothbrush after an illness, but it does say you should replace it every three months.
To set the record straight, there is no such thing as reinfection by reusing a toothbrush. Yes, every three months is ideal as recommended by your dentist. However, if you notice the bristles are worn down and frayed, even if it hasn't reached three months, toss it in the trash and get yourself a new one.
If you shop for toothbrushes you'll find that there are different types. There are soft, medium, and hard toothbrushes. Your dentist recommends a soft-bristled toothbrush because it's gentler on your teeth and gums. According to studies, hard bristles can cause premature enamel erosion and may also puncture your gums and cause gum recession.
Brushing should be done daily–twice a day to be exact, for approximately two minutes with the time divided equally in each quadrant of your mouth.
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