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Cartmen: no, it's not common but it can happen. Get it checked out and yes you should be concerned about anything that causes pain.
Woot: it's very normal to get staining there since these areas of in more contact with food and there are grooves in the teeth. It just means that there's another reason to get regular cleanings.
Cerebrus: excellent point. I've mentioned it throughout this thread... if cost is an issue then go to a local dental school. Prices will be similar to (if not cheaper) than what that website showed and the work will be top quality or it won't go in your mouth.
Willravel: Yes, fluoride is toxic. So is oxygen. At limited doses, both are very safe and even beneficial. For some reason there is a movement in the US of people who try to push the idea that there is a massive conspiracy to push fluoride into the population. I've seen no studies to substantiate that. There are also groups who believe that root canals cause all sorts of neural problems and that Barney is a real dinosaur. No way to please everyone.
innovis: similar idea. There's simply no evidence to substantiate this claim even thoughit's been studied for decades. Amalgam fillings do contain mercury until it's placed in your mouth. Once it is mixed in that mixing machine the mercury reacts with the other substances to form different compounds (too lazy to look it up again) from which mercury cannot be isolated. It's like trying to extract sugar from a cake you just baked. Mercury does not get intruduced into your body as the filling breaks down.
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