If u have an ulcer from that long a duration I suggest u go for a dental check-up. You could be having a sharp tooth etc that's impinging in ur cheek constantly or something u can't figure out for yourself!

Apply clinora gel/ dologel CT 3-4 times a day take multivitamin or tab.zincovit for 5 days 2 times a day. Eat more fibrous diet Drink more water.

An oral ulcer usually heals within 7 to 10 days unless complicated by secondary factors. The duration of your problem warrants a proper clinical evaluation so that the right diagnosis can be established. You can apply anaesthetic ointments like dologel CT for temporary symptomatic relief till that time. You can also post a clinical picture of the affected area on Practo for an online consultation with a specialist. Regards.