I have had root canal two years ago, I had it to four of my lower front teeth because of a trauma that occurred in the lower jaw, I had unbearable pain later after the treatment everything is fine.I had no issues whatsoever until two years but recently they was a sensation that started from a mild pain and continued to be very serious and the pain was targeted only when I ate hot food, I googled to know that this would happen if bacteria is developed inside the treated root canal, I didn’t get my tooth capped and though would have to reopen to get it treated, upon a suggestion from a dentish I used it and got relived. I thought the sensodyne was only for cold sensation but it works on hot sensation too.