went to the dentist and got a root canal treatment done on one of my molars. i've had a cavity in that tooth for maybe 5-6 years. i got filling done twice, the last filling came out about more than a year ago, but never felt any sort of pain in the tooth. started feeling some slight inkling of pain last week, so decided i should finally get a root canal done. it was totally painless, the only painful sensation i had was only a tingling one, that also only once, when the dentist was injecting the anesthetic. then my whole lower left lip became numb and it was quite funny to touch that part. the whole procedure lasted about 40 min, i think. he basically drilled a hole in that teeth, cleaned out all the nerve tissue there in multiple scrapings, drillings, cleanings with water; and then put some polymeric substance into the cavity and kind of fused it. he showed me the x-ray after the treatment and the whole tooth looked pretty good compared to how it was before. it was clearly noticable that he had done a pretty good job, since the filling seemed to fill up the whole nerve cavity without any left out nooks.