Tender gums back of mouth

The sore area is usually the gingiva behind or around the last molar, where a toothbrush may miss the gum margin and where food can collect. If a wisdom tooth is emerging, a loose gum flap called an operculum can become swollen when plaque and food sit beneath it; pain can also come from decay in the last molar, a cracked tooth, or inflammation around the tooth root.

Clean the area gently with a soft toothbrush and use dental floss or an interdental brush where it fits without forcing it under the gum. Rinse after meals with water, avoid picking the gum or placing tablets directly on it, and follow the label or a pharmacist’s advice if you use a pain medicine. If the soreness is linked to an erupting wisdom tooth, a dentist may irrigate beneath the gum flap, remove trapped debris, treat decay, or discuss removal of the tooth when its position repeatedly causes problems.

Arrange a dental examination if the tenderness lasts more than a few days, returns, or is associated with bleeding, a bad taste, pus, persistent bad breath, toothache, or difficulty chewing. Seek urgent care for swelling of the face or neck, fever with worsening mouth pain, trouble swallowing or breathing, or difficulty opening the mouth, because these can indicate an infection that needs prompt treatment.

Ask whether the tenderness is coming from the gum, the last molar, or a wisdom tooth, and whether an X-ray is needed to assess the roots and available space. Ask what treatment will remove the cause, whether the gum flap needs cleaning, and which warning signs mean you should return sooner.