1. Causes of toothache in pregnant women During pregnancy, due to changes in hormone levels, pregnant women are prone to oral problems, such as gum swelling and pain, oral ulcers, etc. In addition, changes in eating habits can also affect oral health. The main causes of toothache in pregnant women are dental caries and periodontitis. 2. How to prevent toothache in pregnant women. Prevention is the best treatment method. Pregnant women should maintain good oral hygiene habits by brushing their teeth twice a day and using fluoride toothpaste. Visit your dentist regularly to check on your oral health. In addition, maintain a balanced diet and reduce