Toothbrushes should be replaced as soon as the bristles show signs of wear, splay, fray or when the color indicator changes color. Generally, this is every 8 to 12 weeks. A worn toothbrush would not be able to clean as efficiently as a normal one.
http://www.intelligentdental.com/2010/02/22/are-you-brushing-your-teeth-away/
If there is mold on your toothbrush, it's time to buy a new toothbrush.
Umm, why does a bunny need a toothbrush?
nope
New parts for electric toothbrushes - including new brush heads - are accessible from the maker and post-retail suppliers and are ordinarily sold through medication and markdown stores. On the off chance that you do need to chip away at an electric toothbrush, about the main instruments you'll need are a screwdriver and possibly a multime.
throw it out or get a new one.
buy a new one
As of September 2008: Nick got a new toothbrush and this color is BLUE source:nickjonline.com
it might be to the toothbrush but it might not so when the cold sores go brush your teeth with the same toothbrush if they come back its because of the toothbrush.
Toothbrush
every month my dentist told me that
They like rubber on your toothbrush and they also like toothpaste. Be sure to rinse/clean your toothbrush at all times and get a new one every 1-3 months - hygiene reasons.
The best way to change the battery on a Braun electric toothbrush is to simply remove the current in place battery by removing the rear cover via the clip at the base of the toothbrush. Obviously different models have this clip in different places. Once the old battery has been removed the new battery can be easily clipped into the toothbrush.