Swelling behind molar

Swelling behind a molar can come from inflamed gum tissue, a partly erupted wisdom tooth, or an infection near the tooth.

The gum behind the last molar may cover a wisdom tooth and trap plaque or food. Decay, pericoronitis, gum disease, and a dental abscess are other possibilities.

Rinse gently with warm salt water, brush softly, avoid puncturing the area, and use a cold pack outside the cheek. Arrange an examination to identify the cause.

Seek urgent care for spreading swelling, fever, pus, severe pain, trouble opening the mouth, or difficulty swallowing or breathing.

Ask whether the swelling is around a wisdom tooth, gum pocket, or tooth root, and whether an X-ray or drainage is needed.