Swollen gum under crown
A swollen gum beside or beneath a dental crown may be caused by trapped plaque, irritation, a loose crown, or infection.
The short answer
Swelling beneath or around a dental crown usually comes from plaque irritating the gum, an overhanging or loose crown, or infection in the tooth or surrounding tissues. A dentist needs to examine the crown margins, gum pocket, bite, and tooth with appropriate imaging to identify the cause.
What is the direct answer?
What does this question mean?
The tissue around a crown is gingiva, and it can become red, tender, puffy, or prone to bleeding when plaque collects where the crown meets the tooth. Swelling may also reflect a trapped food area, a crown edge that presses on the gum, decay under the crown, a cracked tooth, or an abscess arising from the tooth root.
What can you do next?
Clean gently along the crown margin with a soft toothbrush and fluoride toothpaste, and use floss or an interdental brush if it passes without forcing it into the gum. Rinse with warm salt water for temporary comfort, avoid picking at the swelling or chewing hard foods on that side, and arrange an examination rather than trying to glue or adjust the crown yourself.
When should you seek dental care?
Book dental care promptly if the swelling persists, recurs, bleeds easily, causes pain on biting, produces a bad taste, or appears with a loose or fractured crown. Seek urgent dental assessment for facial swelling, fever, pus, difficulty opening the mouth, or trouble swallowing or breathing because these can indicate a spreading dental infection.
What should you ask the dentist?
Ask whether the gum inflammation is caused by plaque, the crown fit, decay, a cracked tooth, or infection at the root, and whether the crown margin and contact between the teeth can be cleaned properly. Ask what the examination and X-ray show, whether the crown needs cleaning, adjustment, repair, or replacement, and whether the tooth needs a filling or root canal treatment.
Frequently asked questions
Can a crown cause gum swelling?
Yes. Plaque, a crown edge that irritates the gum, a poor contact that traps food, or pressure from a loose crown can cause localized inflammation.
Does swelling mean the crown must be replaced?
Not always. The dentist may resolve the problem with professional cleaning or a small adjustment, but decay, a damaged crown, or an infected tooth may require repair, replacement, or treatment of the tooth.
What if the crown hurts when I bite?
Pain on biting can occur when the bite is high or when the tooth, ligament, or root is inflamed, so the dentist should check the bite and assess the tooth rather than simply smoothing the crown without examination.