<s>[INST] I recently had a root canal and a crown done within the past two weeks.  I have tooth sensitivity to hot and cold since the procedure. The gum around the canine fells as if it is not sealed properly.  Ive purchased sensodyne toothpaste but that does not help. [/INST] Thanks for your query, I have gone through your question the sensitivity will not be there if the tooth is treated with root canal treatment, because there will not be any vital part inside the tooth after root canal treatment...just get your adjacent teeth checked for any abrasion of worn out enamel exposing the dentin might cause sensitivity...even decay in other teeth can cause sensitivity.kindly consult your dentist for further treatment.I hope my answer will help you </s>