How to get rid of a canker sore on a tonsil?

Canker sore?: How do you know it is a canker sore? It may also be bacterial, viral or something else. Do you have any other symptoms? If not, rinse with salt water and it should be gone in 5-10 days. If it persists or you have other symptoms, see your physician for a definitive diagnosis and appropriate treatment.

Gargle and avoid...: Since you mouth is teeming with bacteria, and the sore is the result of a herpes reactivation to due the virus perceiving stress: 1. Reduce the bruden of bacteria near the wound by gargling with listerine or salt water 60seconds twice a day until the sores go away (the bacterial load near the sore may delay healing), and 2. Avoid sour, citrus, acidic, spicey foods which will irritate the sore.