Brushing your teeth regularly is good, but if you brush with an old and worn out toothbrush you’re not doing your teeth any favors. The dentists at Yaletown Dental in Vancouver advise you to replace your toothbrush after every three months to keep your pearly whites shining bright. If you notice that your bristles are getting bent out of shape, you know they will not be effective in removing food debris from your mouth. Brushing every day, twice a day can wear out your toothbrush and you will be the best judge of when to replace it – so if you notice that it is looking worn out, it is time to replace it. However, the thumb of rule is three months to be on the safe side.