If you are having canker sores, the Miracle-Mineral-Supplement may aggravate it...You're better off to get some good bacterial culture into you (acidophilus/good yogurt), then resume the Miracle-Mineral-Supplement when the sores have closed up. Otherwise, you can use the Miracle-Mineral-Supplement unactivated as a mouth wash to continue treating your mouth. Tom recommended 3 mls MMS unactivated in 500 ml of water for a mouthwash. The acid present in your mouth will be enough to activate it for that use.