The mercury in the Amalgams is one the known cause of candida (with antibiotic). It is best to get rid of the amalgalms (and to get rid of the heavy metals (mercury and others) through chelation. But it can be very expensice. When I have read testimonials of people getting rid of candida with amalgams.
When you will take it out, do make sure you resume the candida diet prior to the intervention to avoid a relapse. ANd do make sure you choose a dentist who is aware of the mercury problem so he avoids letting the mercury leak into your mouth. Mine would even have a 'vacuum' is action close to my mouth to trap the volatile gas while extracting.