Joyce (Lansdowne, Pa) on 07/23/2015

About 7 years ago I had a bridge installed in my mouth. At the time the dentist was shaving down one of the tooth to accommodate the bridge he shaved down too far exposing the nerve. I subsequently had to have a root canal done. A year later the bridge fell out because said tooth was broken. A post was installed and the bridge rebonded. About 6 weeks ago, the bridge became loose. I went to the dentist, he took out the bridge soak in in some listerine and then rebonded. A week later I went in to have my annual cleaning done and everything went well. A day later, I started to have pains in the tooth where the root canal was done. It was unbearable to the point where I could not eat.
Two days later was late Friday and the dentist was closed at 2 p.m. I was thinking that I would call them on Monday and I believed that the tooth would have to be extracted surgically as it was broken (I had the same experience in the past). I used baking soda and hydrogen peroxide to brush my teeth and I decided to spray the hydrogen peroxide directly on the tooth and went to bed. The next day, to my surprise there was no more pain. I sprayed the tooth again in the morning and at night and to this day I have had no more pain.
Arazak (Kuala Lumpur, Malaysia) on 04/14/2007

H202 for toothache: I was recommended by a friend to gargle for one minute with H2O2 3% solution 2 or 3 times per day and repeat for three or so days to relieve throbbing pain. And IT WORKED.
Anonymous (USA) on 06/28/2006

If you have a terrible toothache, put a capful of 3% peroxide in your mouth and hold for ten minutes several times a day. The pain will diminish quickly.