What's usually recommended for getting rid of mouth ulcers forever?

You can't: Almost everyone has the herpes virus that causes these ulcers. If you get frequent outbreaks, some say chicken pox vaccinations can help. But, whenever your resistance dips, you, like everybody else, can get these ulcers.

Unfortunately, none: Canker sores are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The ulcers are usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned see your dentist for laser therapy.