Without a photograph it is difficult to give you an exact answer. Did you have root canals done on the teeth when the crowns were done? It's possible that you are seeing the root through the gum tissue. Many times when a tooth has a root canal it becomes dark. In the front of the mouth the bone...
This color is due to the light going into the tooth with very little reflection. It is possible to ues an opaque white filling but it is very rarely a cosmetic problem.mmA new crown can be done in the future but is rarely worth the expense.
Without a picture it is difficult to determine the answer to your question without a picture. It is very possible to mask out the qrey caused by having a root canal. Also, a good dentist and lab should be able to accomplish this with only working on one tooth. The thing to know is that the tooth...
