Troubles with Cementum? Prevent ‘Em!

Medically Reviewed by Dr. Robert Bagoff on September 3, 2026

Cementum is the thin layer of connective tissue that covers the root of each tooth below the gum line, anchoring it to the surrounding bone through the periodontal ligament. Unlike enamel, cementum is soft, which means that once gum recession or injury exposes it, decay and sensitivity can develop and progress far more quickly than they would on the visible crown of the tooth.

Because cementum sits below the gum line, most patients never think about it until a root cavity or sudden sensitivity sends them looking for answers. At Bagoff Dental Arts, we check for early signs of gum recession and root exposure at every visit, since catching cementum problems early is far easier than treating them after they progress. Here is what cementum does, what puts it at risk, and how to protect it.

What Cementum Does and Why It Matters

Each tooth is made up of several layers working together. Enamel, the hardest substance in the human body, protects the visible crown above the gum line. Beneath it, dentin carries microscopic tubules that connect to the pulp, the soft tissue at the tooth’s center that houses its nerves and blood supply. Cementum covers the root below the gum line and anchors the tooth to the jaw through thousands of tiny periodontal ligament fibers.

Because cementum sits below the gum line, it is normally shielded from the bacteria and plaque that attack enamel every day. That protection depends entirely on the gum tissue staying in place, which is exactly what gum recession undoes.

How Cementum Becomes Exposed

Gum recession, the gradual pulling back of gum tissue from the tooth, is the primary way cementum becomes exposed to the same bacteria and plaque that cause cavities in enamel. According to the Cleveland Clinic, common causes of gum recession include brushing too hard or with a stiff-bristled brush, plaque and tartar buildup, periodontal disease, and trauma to the gum tissue. Gums also thin gradually with age, which means some root exposure can develop even in patients with excellent oral hygiene.

Three conditions account for most cementum problems we see:

• Cementum erosion: Once cementum is exposed, it wears down more easily than enamel because it was never designed to face the same daily wear. A small cavity on the root can progress to the pulp faster than one on the crown, sometimes requiring a root canal if it is not caught early.
• Gum disease (periodontitis): Advanced gum disease creates pockets between the tooth and gum that trap bacteria, which can attack both the cementum and the bone beneath it. Scaling and root planing, a deep cleaning that smooths the root surface, is often the first line of treatment.
• Trauma: Chewing on ice or hard candy, bruxism, and sports injuries can crack the cementum below the gum line just as they can crack a tooth above it, sometimes without any visible sign until sensitivity or pain appears.

Signs Your Cementum May Be at Risk

Because cementum sits below the gum line, most people first notice a problem through sensitivity rather than a visible change. Watch for a tooth that reacts sharply to hot coffee, cold drinks, or even a breath of cool air, a tooth that looks visually longer than its neighbors, a notched feeling at the gum line, or discomfort that lingers after eating something sweet. Any of these can signal that gum recession has exposed the cementum underneath.

Protecting Your Cementum

The same habits that protect enamel also protect cementum, since preventing gum recession is the most reliable way to keep the root covered in the first place.

• Brush gently with a soft-bristled brush. Aggressive brushing is one of the most common, and most avoidable, causes of gum recession.
• Floss daily to keep plaque from building up along the gum line, where it contributes to both gum disease and recession.
• Keep up with regular exams so we can catch early gum recession or root sensitivity before it becomes a cavity.
• Wear a properly fitted mouthguard for sports and address teeth grinding early, since both protect the root as much as the crown.

If your dentist or hygienist notices early gum recession, treatment options range from a desensitizing agent applied at your next cleaning to, in more advanced cases, a gum graft that covers the exposed root and restores its protection.

How Bagoff Dental Arts Can Help

Our team checks for gum recession, root sensitivity, and early cementum exposure at every routine visit, so problems below the gum line are caught long before they become a root cavity or require a root canal. If you have noticed new sensitivity to hot, cold, or sweet foods, or if it has simply been a while since your last general dental checkup, we would rather see you now than after the discomfort worsens.

Healthy gums are the foundation that keeps your cementum protected, and protecting your cementum is part of protecting your whole smile. Reach out through our contact form to schedule an exam.

Frequently Asked Questions About Cementum and Root Sensitivity