Frequent mouth ulcers are quite common and, although painful, they are usually not serious. They can happen due to reasons like vitamin deficiencies (especially B vitamins and folic acid), stress, lack of sleep, minor injury from sharp teeth or brushing, spicy or acidic foods, or sometimes acidity-related irritation, often described as stomach heat. The medicines you are taking, Folitas 5 mg or B-folcin Tablet, help correct vitamin deficiencies, which is a good step. In addition, you can reduce ulcers by maintaining good oral hygiene, using a soft toothbrush, avoiding very spicy, hot, or citrus foods, and drinking enough water. Applying soothing gels or using medicated mouthwashes can help reduce pain and speed healing. Managing stress, eating a balanced diet with fruits and vegetables, and ensuring proper sleep also play an important role. However, if the ulcers are very frequent, very large, last more than 2 weeks, or are associated with fever, weight loss, or difficulty swallowing, you should consult a doctor or dentist for further evaluation to rule out other causes and get specific treatment.