<s>[INST] had a fracture in my upper molar last fall had pain when eating on that side for several weeks. Pain left a few weeks later and now came back when chewing about 3 weeks ago (early February) had a temporary crown put on last week (Tuesday) pain left a day or so after.. but a day later i noticed a white bump above temporary crown on outside of gum and seemed a little sore -- it didn t hurt even when eating but tonight I pressed against the white bump above the crown rather hard and the tooth has become sensitive again when I bite down on it. What caused this sensitivity to return? What might this be and should i have it checked or wait a little longer to let it heal? [/INST] Hello, Thanks for posting your query, There are many factors that may lead to sensitive teeth, including. Inflamed and sore gum tissue may cause sensitivity due to the loss of supporting ligaments, which exposes the root surface that leads directly to the nerve of the tooth. Chipped or broken teeth may fill with bacteria from plaque and enter the pulp causing Inflammation. Sensitivity can occur following teeth cleaning, root planing, crown placement, and tooth restoration. Sensitivity caused by dental procedures is temporary, usually disappearing in four to six weeks. Get professional tooth cleaning, oral hygiene instructions, and fluoride treatments every six months (or sooner depending on your condition). I hope this information has been both informative and helpful Regards </s>