Originally Posted by MrsGuther
I've used hydrogen peroxide to rinse my mouth with before. I didn't do it that many times though. It was part of my long running attempts to whiten my teeth without paying out the wazoo for whitening strips. Lol. It made my gums sore.
It works much better and is easier to use (tastes better too) if you mix it 50/50 with vegetable glycerine.