I have toothache.don't have any cavities &tooth looks good from outside.It is the left incisor from front in the upper jaw.I visited dentist yesterday & he said that I might have any sort of injury 2 years back.I remember,I had hit the same tooth earlier.X-Ray taken by him shows black thing above the tooth which he doubts to be infection.He prescribed medicines and advised to wait&watch otherwise RCT shall be performed.Medicines give relief only for 4-5 hours and after that the pain starts.