Originally Posted by truth.seeker
My molars have very large amalgman fillings and cracks in the teeth with probably decay under the fillings which usually leak. Some of my teeth are sore to bite with from time to time. Dentist said I better do something about this. When these amalgmans are taken out, the structure of the tooth will require a crown- I guess for support. Some of the teeth may not need crowns.

truth.seeker

It is a total myth that crowns provide "support" that would not be provided by large fillings . Crowns weaken your teeth and require the removal of much more of a tooth than a filling . Dr Jerome's book "Tooth Truth" has several pages explaining why you should not get crowns. Even if you have some fractures , fillings are better than crowns.
Most fractures are caused by amalgam fillings because they expand continuously eventually cracking teeth . Gold fillings and ceramics do not expand and crack teeth . Composites often shrink on teeth and cause fractures.