My son had an implant 18 months ago that failed. It was removed, had a bone graft, waited 6 months, then had another implant. He then waited several months while it healed and the temp crown fell off at least 10 times during that period. He got the permanent crown 2 months ago and it came off. Son must have swallowed it with his dinner. We paid for 5 year warranty. Dentist said warranty no good without having the crown to see if it failed. Obviously it failed, there was a cement issue, or his work was shotty. It's only been 2 months! We paid over $6000. He expects us to pay him again. And they even told me we overpaid $700 and they didn't return the money. They just left it on our account as a credit. I don't think it's unreasonable to expect it to last longer than 2 months. We certainly wouldn't have paid that much money if we knew it wouldn't. What can we do?