Hi - If it were my tooth, I would definitely see a periodontist before going through with the procedure. My son had a root canal which also bothered him for a long time afterwards. He finally did have the tooth pulled and had a tooth implanted.(he's very happy that he did) This is expensive, but if you are going to continue to have problems with taste, etc., it's worth having it pulled and saving the $625 and then at some later time having a tooth implanted. Frankly, I wouldn't trust a dentist who told me the tooth was "fine" when I was having the problem you are having. You are wise to question his opinion. A second opinion never hurts, and this second opinion would be from a specialist in that field.