The optimal frequency of toothbrush replacement.

Replacing your toothbrush on a regular basis is essential to maintaining proper oral hygiene. Dentists usually recommend replacing your toothbrush every three to four months. This is because the bristles of a toothbrush deteriorate, crack and deform over time. As a result, the toothbrush becomes less capable of cleaning and less effective at removing food particles and plaque. Prolonged use of your toothbrush can also lead to bacterial growth, which can damage your dental health. Of course, if the bristles of your toothbrush are visibly worn or deformed, you should replace your toothbrush immediately. Similarly, if you have just recovered from an oral disease, it is recommended that you use a new toothbrush to avoid re-infection.