Dark Lines Along the Gumline
October 27, 2025
If you’ve noticed a thin, dark line where your gums meet your teeth, you’re not alone. These lines are common, but they can have different causes, and some are easier to fix than you might think.
Why It Happens
Dark lines can appear for several reasons:
- Crown material: Older porcelain-fused-to-metal crowns often show a dark gray line where the metal base meets the gumline.
- Dark root from prior treatment: Teeth that have undergone root canal therapy or experienced trauma can darken over time, creating the appearance of a shadow near the gum.
- Gum recession: When gums recede, the edge of a crown or tooth root can become exposed. This area may appear dark and is often mistaken for decay.
- Cavities or tartar buildup: Decay or hardened plaque along the gumline can create dark spots or lines that only professional cleaning and treatment can remove.
What You Can Do
Treatment depends on the cause:
- Replace old metal-based crowns with all-ceramic or zirconia restorations that match the natural color of your teeth and gums.
- Address gum recession early with gentle cleanings, improved home care, or soft-tissue grafting if needed.
- Treat decay or buildup promptly to prevent further damage to the tooth and gumline.
- Maintain good brushing and flossing habits and visit regularly for professional cleanings to keep your smile bright and healthy.
A Natural, Seamless Smile
At Spaulding Dental Co., Dr. Melissa Spaulding uses advanced materials and precise craftsmanship to restore a clean, natural gumline. Modern ceramics blend beautifully with your natural enamel, eliminating the gray shadow of older restorations and brightening your entire smile.
If you’ve noticed dark lines or discoloration near your gums, we can help determine the cause and create a treatment plan that restores both your confidence and your gum health.