When you consider that your toothbrush is exposed to bacteria every day, it is totally unrealistic to expect it to last indefinitely. The American Dental Association strongly suggests replacing your toothbrush at least every four months or sooner if:
– Bristles are worn or frayed
– There has been an illness in the household
– You have been treated for gum disease or tooth decay
Also, a 15-minute soak in mouthwash will help to deep-clean the brush and bristles.
A good toothbrush is vital to keeping teeth and gums healthy and avoiding unnecessary trips to the dentist. It’s also “never a good idea to share your toothbrush” and further tips can be found at http://yourdentalhealthresource.com/everything-you-need-to-know-about-your-toothbrush/.