Mouth ulcers can be very painful, especially while eating, drinking, or speaking, but most ulcers improve within 1-2 weeks with proper care. For quick relief, avoid spicy, sour, salty, or very hot foods, as these can worsen irritation and pain. Drinking plenty of water and maintaining good oral hygiene with a soft toothbrush may also help the ulcers heal faster. Warm salt water rinses 2-3 times a day can reduce discomfort and keep the mouth clean. Applying ulcer gels may help reduce pain and support healing. In some people, vitamin supplements such as vitamin B complex may also help, especially if the ulcers are related to nutritional deficiency or weakness. Stress, lack of sleep, acidity, dehydration, accidental cheek biting, and vitamin deficiencies are common causes of mouth ulcers. Try to get enough rest, eat a balanced diet, and avoid tobacco or smoking if applicable. Mild pain-relief medicines may sometimes help if the pain is severe, but repeated or long-term use should be avoided without medical advice. If the ulcers are very large, keep returning frequently, last more than 2 weeks, or are associated with fever, difficulty swallowing, weight loss, or swelling, you should consult a doctor, dentist, or ENT specialist for proper evaluation and treatment. Persistent ulcers may sometimes require further tests to identify the underlying cause.