Hydrogen peroxide has many uses and can be used to treat things such as cuts, scrapes, sores, canker sores etc.
Hydrogen peroxide is great for swishing around your mouth when you have a canker sore inside your mouth.
The hydrogen peroxide will kill the bacteria and virus causing the canker sore and get rid of the canker sore.
A few other uses for hydrogen peroxide are, clearing up acne, whiten nails, disinfecting toothbrushes, bleaching your hair and when applied to your acne scars the hydrogen peroxide can overtime clear up acne scars.