Kank-A® Mouth Pain Liquid is ideal for treating canker sores and other abrasions inside the mouth. This canker sore cream combines the maximum allowable level of anesthetic for fast, temporary pain relieve. In addition to Kank-A Liquid delivering a maximum strength medication, it also forms a long-lasting barrier that protects the sore unlike most other medications which simply wash away. .33 Fluid ounces. This is a Special Order item and may take 7-10 business days to be delivered.