Mouth ulcers that take vitamin B2 usually clear up in about a week. In general, most mouth ulcers can be healed on their own, usually in a week or so most of them can be healed. Mouth ulcers are a multifactorial disease; infections, immunity, heredity, anxiety, late nights and other factors may trigger mouth ulcers. Therefore, the treatment of mouth ulcers is not necessarily to take vitamin B2; however, vitamin B2 has the effect of promoting the recovery of the ulcerated mucous membrane, so it is beneficial to the recovery of the ulcerated surface. Mouth ulcers are a self-healing disease and can usually heal in about a week even without any medication; the use of medication serves to relieve pain and shorten the duration of the disease. Therefore, if you suffer from mouth ulcers, most of them will recover in a week or so, and a light diet and reasonable rest are recommended. Those who suffer from recurrent attacks or persistent non-healing need to consult the dentist in time to determine the relevant treatment plan.