Brushing is advised at least twice a day if not after every meal for no more than 2 minutes. Soft bristled toothbrush is recommended. As per average scenarios, every 2-3 months is a good time to switch to a new brush because if the bristles are bent or splayed out, then they can’t be efficient and also can harm your gums. Continuous inspection of the brush head is a better way to evaluate when exactly to change a toothbrush.