get a second opinion. dentists will do anything they can to get business in the office. a crown should last a lifetime, or at a minimum of 20yrs if its done correctly. is he doing the root canal too? if not do not go to the person he recommends ask friends. alot of times the dental professionals r all in cahoots and $$$. enodontists, periodontists, the labs that do the crowns. impacted wisdom teeth shouldnt require removing bone. are you having any problems with the crown? or the tooth next to it. how are your gums? id want to see the xrays. ive never seen so many root canals being done on peoples teeth. all age groups.