Not for me. I have used mine for a few years now and my teeth are always squeaky clean and last check up said they were healthy. =)

Not to my knowledge, and I have never had a cavity and just two wisdom teeth removed.

I have never used an electric toothbrush, but I did some research round the net for you to see if other people had had problems. Here are some comments: My dentist did not recommend using an electric toothbrush because it can cause grooves in the teeth if it is a steady moving brush...www.epinions.com/.../display_~reviews Abrasive Electric Tooth Brushes May Be Dangerous To Your Health The abrasive electric toothbrushes may be dangerous for your health since they can also forcefully wear away mercury fillings. The rapid wearing of poisonous mercury fillings can result in the slow poisoning of your body as the mercury accumulates in your organs and tissues. If you eat enough greens and nutritious foods to detox your body of the mercury, this may not become a problem. But most people do not eat enough high-density foods to rapidly detox their bodies. The stronger the electric toothbrush, the more danger there will be. An example is Braum's powerful electric toothbrush that targets tartar. What an electric toothbrush can do to tartar, it can also do to Mercury (wear it away). This powerful electric toothbrush could also scratch your teeth or chip pieces off your teeth, especially if your teeth is already "weakened" with fillings. A body weakened by mercury is more susceptible to a host of diseases and germs. Mercury may also cause autism and mental problems. Mercury is more dangerous to our health than lead is, so it seems best to avoid harsh electric toothbrushes. The website below suggests you brush your teeth by hand. http://hills.ccsf.cc.ca.us/~jinouy01/danger/electric_toothbrush.html Selecting a toothbrush You can get good results with either an electric or a manual toothbrush. For an electric tooth brush choose one with a round head and an oscillating action. Make sure the bristles are soft—they clean better because the bristles flex around the teeth and into crevices. Also, hard bristles wear teeth, resulting in grooves and gum recession. Use a brush with a small head so that you can get right to the back teeth. Make sure that the brush that feels good in your hand. Depending on how hard you brush, toothbrushes last a month or two. The moment the bristles look 'dog-eared' get a new one. http://www.finedentistry.com.au/Hygiene.htm There seem to be good things and bad things about both manual and electric toothbrushes. I would suggest you talk it over with your dentist, if you are concerned.

if you are having gum problems, the higher end electric brushes come with a safety device that if you are pushing too hard they will stop spinning