I have about 5 or 6. Some of my teeth grew with a deep crevice and my dentist thought it would be best to fill them to preserve them. One of my teeth cracked and I have a crown now. My fillings are all the old amalgam ones. My sister had hers removed and replaced. My dentist doesn't like to do that because removing the amalgam would expose me to more of the undesirable metal and the white fillings don't last as long.