[YEA] I've used hydrogen peroxide, 3% pharmacy grade cut 50% with water, to rinse my mouth before brushing, which has been a great help with eliminating bad breath and plaque. But here's a remedy that no one may have thought - a treatment for "tinea cruris" commonly known as jock itch. I had an issue with this for several months and during this period, several times a week, I used Curex and other over-the-counter options to eliminate it, spending $20.00 to $30.00 to no avail. I knew hydrogen peroxide was effective in killing bacteria, so, as a last resort, I cut the pharmacy 3% grade 50%, just like the mouth wash, and used it-in 2 days!!! the itch and soreness was gone! No joke. Total cost 20 cents!