Canker Cover is a patch made from edible ingredients that sticks to canker sores within seconds and forms a clear cover that will last for eight to 12 hours. This protective patch helps keep irritants like food, drink and braces away from the canker sore and ensure it heals faster. The Canker Cover won’t come off even while eating or drinking and even has breath-freshening properties to boot. In many cases, one patch fully treats most canker sores. And perhaps the best part is that the Canker Cover also provides immediate pain relief for the mouth sore. Plus, because Canker Cover is made from edible ingredients, you know it is perfectly safe to use whenever canker sores appear. Each Canker Cover package contains enough patches to treat four to six canker sores.