Cankerboy is a daily supplement that helps reduce or prevent the occurrence of canker sores for people who get them regularly and for no reason - a condition known as recurrent aphthous stomatitis. Based on university double-blind studies, the simple formula has shown to be effective for 78% of people who try it. Your sores will occur less frequently, go away faster, and hurt less and for many people, go away completely. It works by preventing an overreaction in the immune system that destroys cells around sites of micro trauma, which leads to canker sores.