How can I stop a canker sore before it grows bigger?

Cautery for cankers. Cautery can stop canker sore growth. Topically applied debacterol is one such product used to achieve this.
Licorice. Licorice has been used since ancient times to treat canker sores in the mouth. Also, small studies show it can be effective when used as a mouthwash -- 50-75% improvement in 1 day. Http://tinyurl. Com/kr9aeau sucking on dgl lozenges may work also. Other studies showed positive results with a dissolving licorice disk placed on the sore. Http://tinyurl. Com/mdvde3o.