Swelling and pain in the gums around the teeth are most commonly due to gingivitis or early gum infection caused by plaque buildup, and it can usually be managed with good oral hygiene: brush gently twice daily with a soft toothbrush, floss regularly, and rinse with warm salt water or an antiseptic mouthwash to reduce swelling and bacteria. Avoid tobacco, very sugary foods, and harsh brushing. However, since there is pain and swelling, it is important to visit a dentist for proper cleaning (scaling) and to check for deeper infection, as you may need prescribed medicines. Seek care sooner if there is severe pain, pus, fever, or increasing swelling.