Yes, Kenacort 0.1% (triamcinolone) is useful in treating mouth ulcers. It reduces pain and swelling while also speeding up the healing process. Apply a tiny amount directly to the ulcer 2-3 times each day, and refrain from eating or drinking for 30 minutes thereafter. Use it only for a few days because it is a mild steroid. See a doctor if your ulcers keep recurring or do not improve.

A solitary mouth ulcer that hasn't healed in 10 days could be caused by persistent irritation (biting, sharp teeth, spicy foods), stress, vitamin shortages (B12, folate, iron), or an infection. It may also require a stronger topical therapy. Avoid hot meals, use a medicated paste such as Kenacort, and practice proper oral hygiene. If it lasts more than two weeks, consult a doctor to rule out other possible causes.