Tooth next to right front had root canal and 4 weeks ago had a new crown and has been loose ever since. Dentist told me the problem is the root. When I had the previous crown it was solid but the crown had been warn so I opted for a new crown. The temporary crown he cemented was tight but since the new one has been in, it has been loose. I think it is the interior fit of the new crown not either properly fitting the base buildup and/or the bonding issue. Please advise, thank you very much, Richard