Unhealthy gums are often swollen, red, and painful. Triggers for swollen gums usually include poor dental care, malnutrition, poorly fitted dentures, or side effects of a medication. To prevent swollen gums, the National Library of Medicine recommends the following: consume a balanced diet that includes a wide variety of fruits and vegetables; skip foods that can lodge under the gums, such as popcorn or chips; avoid mouthwash that irritates your gums; brush and floss your teeth regularly; and visit your dentist or periodontist a minimum of every six months. National Library of Medicine, November 2018