Gargle and avoid...
Since you mouth is teeming with bacteria
, and the sore is the result of a herpes
reactivation to due the virus
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.