Is there any medication to cure mouth ulcers forever?

No, to this day there is no such medication available. Some treatments are known as efficient but can be managed only in hospitals and with very embarrassing or disabling side effects.

Aftazen: mouth ulcer treatment discover our study on mouth ulcers
In Great Britain, 1.5 million people have mouth ulcers crisis more than once every two month

Tip of the day:

Be attentive to your oral hygiene when you have mouth ulcers to avoid a secondary infection