A canker sore is a small painful ulcer that usually occurs in the mouth. It has a grayish-white base with a red inflamed area surrounding it.

Canker sores respond well to golden seal, both internally and topically applied. Applying a drop of Tei Fu Essential Oils or tea tree oil topically to the sore will relieve the pain in minutes. L-lysine is an amino acid that aids in the prevention of canker sores. Canker sores are more common and severe in areas where VS-C is taken on a regular basis.