Ten years ago, I had a root canal and a crown on my second molar on the lower right side. Three months ago, the crown chipped. The dentist removed the broken crown and put on a temporary. He advised me to see an for a possible retreatment.
After a week, the dentist performed a canal retreatment. He put the temporary back on and told me to have it replaced in two weeks. After two weeks, I went back to the dentist for the new crown. The next day, I went to a periodontist per my dentist's advice. He performed a deep cleaning in the area. He also found an under my gums, which caused bone loss. He put me on antibiotics and said once the infection is cleared, I will have a bone graft done. After a week, I went back to the periodontist for the bone graft. After two weeks, the was healing and the pocket was reduced. When I went back for a check up the said I have a good recovery; the bone is growing in very quickly. He also told me, there is a cavity under the crown. How is it possible to have a cavity under the crown? It is only nearly three months since I got it. I have a good habit. Any thoughts? Thanks.