Well - If you don't have any health issues, I would be weary to replace them. If you do replace them, make sure you do it with a dentist who is aware of the dangers of mercury exposure. Otherwise, you could expose yourself to unmanageable levels of mercury.

Remember - the majority of people with dental amalgams will live normal lives. It's those of us that can't manage it, go on to suffer terribly.

In the end - the choice is yours - So long as you find a good dentist who can safely remove them, then they are probably better off being replaced