Gum line cavity
A gumline cavity is decay near the gingival margin, treated according to its depth and whether the root is exposed.
The short answer
A cavity at the gumline is tooth decay on the cervical surface near the gingival margin, and treatment depends on its depth and whether the root surface is exposed.
Why can exposed roots be less protected than crowns?
The crown is protected by enamel, while an exposed root has dentine and cementum that are less mineralized. Plaque acids can dissolve these surfaces, especially where recession, dry mouth, a rough margin, or difficulty cleaning lets plaque remain.
How can you clean and protect a gum-line cavity?
Use fluoride toothpaste, clean gently along the gumline and between teeth, and reduce frequent sugary or acidic drinks. A dentist may remove softened tooth structure and place resin or glass-ionomer material; deeper disease may require pulp treatment.
When should a sensitive or hollow gum-line area be examined?
Arrange an examination if the area is sensitive, catches floss, looks brown or hollow, or traps plaque. Swelling, spontaneous pain, fever, or a bad taste can signal infection.
Is the lesion on enamel, root dentine, or a filling margin?
Is the lesion on enamel, exposed root dentine, or a filling margin, and does the pulp or gum need treatment?
Frequently asked questions
What information should I bring?
Bring a medicine list, relevant medical conditions, previous dental records, and when the concern began.
Can treatment be chosen without an examination?
No. Examination identifies the anatomy, disease activity, materials, and risks that determine the appropriate option.
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.