Safely Gargle Hydrogen Peroxide... "All tooth whitening is made of peroxide. The gels run from 6 percent peroxide to 32 percent peroxide. If you swish with hydrogen peroxide everyday you will have the same results plus excellent gum tissue! As a dental hygienist, I recommend swishing with peroxide for 1-2 minutes morning and night. It kills bacteria that causes decay, gingivitis, periodontal disease, etc..."