Mouth ulcers during pregnancy can be treated by adjusting diet, paying attention to oral hygiene, maintaining a good state of mind, and the application of drugs. 1. Adjust the diet: during the onset of ulcers, pay attention to a light diet, do not intake of spicy stimulation and hard food, easy to stimulate or damage the ulcers, thus aggravating the symptoms. – 2. Pay attention to oral hygiene: you should do diligently brush your teeth, brush your teeth once in the morning and once in the evening, and rinse your mouth in time after meals. 3. Maintain a good state of mind: learn to self-pressure, relieve their own stress and anxiety, learn to relax, be kind to others, and maintain an optimistic and positive attitude towards the future. 4. The application of drugs: oral ulcers usually do not need to be treated, because the ulcers are self-limiting, 7 to 10 days ulcers will heal themselves. You can also choose to apply oral vitamin C tablets or use saline gargle to relieve pain. Specific medication should be prescribed by a specialist.