does hydrogen peroxide kills bacteria in mouth?
Some people feel that 3% is a bit strong to use as a mouthwash. You can try 3%, or water it down with some water. (Some 3% hydrogen peroxide with an equal amount of water added will give you 1.5% hydrogen peroxide.) Using hydrogen peroxide as mouthwash will kill bacteria and viruses in your mouth. However, it takes time for hydrogen peroxide to work, so this is not going to remove all the bacteria and viruses in your mouth â it will just lessen them. Using hydrogen peroxide as mouthwash can taste a bit weird.