I have a 30-year old cap on a front eye tooth, which also has a root canal and post (also 30 years old). There is now a cavity under the cap, and my dentist has given me two options: extraction and implant later (he has referred me to a peridontist to make sure I have enough bone structure), or extraction & replace with permanent bridge. I am taking a z-pac now for any infection. He says that I will not be able to remove the cap and replace it since it is older and I have the root canal. Is there anything else that I can do? It takes 6-9 months for my gums to heal before I can have the implant. Thanks.