<prompt> Hot tooth is:Tooth in line of fractureDifficult to anesthetiseVertical line fractureVery sensitive to heat test  <response>: A tooth that is difficult to anesthetize is known as a hot tooth. This is most commonly encountered in a mandibular first molar tooth wherein after the anesthetic block, the patient may describe profound numbness of the ipsilateral lip and tongue but still may experience acute pain during the access opening procedure.Ref: Grossmans endodontics, 13th edition, pg no:149 