How Often Should You Replace Your Toothbrush?

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Spending time brushing your teeth everyday might be a waste if you are using an old toothbrush.

“If the bristles are splayed or frayed, they won’t be pointing in the same direction, and they are not as effective at cleaning your teeth,” explains Matt Messina.
A dentist and spokesperson for the American Dental Association. Worn bristles mean that even a good brush could miss plaque and debris, says Alice Lee , a dentist and the associate director of pediatric dentistry at Montefiore Medical Center. 
So most dentists advocate changing your toothbrush once in 3 months or before wear and tear becomes noticeable. And yes, these tips also apply to changing the heads of of electric toothbrushes (sorry, wallet!).
Most dentists advocate changing your toothbrush once in 3 months.
Remembering to change your toothbrush is easy, even if you don’t have superhuman memory. When you open a new brush, do some quick math, and write the date you need to bid it adieu at the bottom of your toothbrush in permanent marker.
One more thing: We don’t need to lose sleep over bacteria accumulating on the bristles of our toothbrush, which means there is no need to chuck our brush every time we get sick, Messina says. 
“Bacteria in the mouth can’t survive a dry environment. So you don't need to go to extreme measures to sterilize your brush.” Just make sure you rinse it after every use and store it with the bristles facing up in a convenient place where it can air-dry.
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