3.Swollen Gums
This may happen if you don’t brush and floss enough or if your mouth or gums get hit. It might help to treat it with a rinse of one part hydrogen peroxide (3%) and two parts water. Swish it for 30 seconds and then spit. Saltwater is another option. Call your doctor if your sore gums stick around for more than about 7 days.
4.Canker Sores
Over-the-counter rinses with hydrogen peroxide (Orajel, Peroxyl) may ease pain and speed healing of these roundish, light colored sores in your mouth. They’re not contagious, but they may hurt a lot. It’s not clear what causes them. Even without treatment, they usually go away in a week or so.
