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"Kiwi, I got 3 amalgams removed from a dentist who follows the proper protocol for about $270.00 per tooth. It was $815 total to have 3 amalgams changed out for composite fillings. If you opt for porcelain it costs a lot more but composites are just fine. "

Composites may not be a good choice for large cavities in rear teeth. They may not last so long. Dental fees vary greatly depending on location.

http://www.bracesinfo.com/dentalcosts/
JK, the 3 teeth I had the mercury removed from were all rear teeth. I've had another composite in a rear toot that has lasted 5 years so far so it has worked well for me.