Cavity below gum line

A cavity at or below the gum line can affect exposed root dentine and may need gum assessment, filling, root treatment, or extraction.

The crown is protected by enamel, but a receding gum can expose cementum and dentine on the root. These softer surfaces can decay near the gum margin, where moisture, plaque, and access can make the lesion difficult to see.

Keep the gum margin clean with a soft brush and fluoride toothpaste, and clean between the teeth without snapping the floss into the gum. Limit frequent sugary or acidic drinks and arrange an examination rather than trying to scrape the area.

Book care for a rough notch, brown or black area, sensitivity, food trapping, or pain near the gum. Swelling, spontaneous pain, or a draining spot can indicate pulp or root infection and needs prompt assessment.

Ask whether the defect is decay, abrasion, abfraction, or exposed root surface, and how deep it extends. Discuss fluoride treatment, a bonded filling, gum treatment, root canal treatment, or removal if those options are relevant.