If you have noticed a small notch or groove where your tooth meets the gum, you are looking at what dentists call a non carious cervical lesion. These wedge shaped dents near the gumline are common, especially with age, and they are not cavities. Two terms come up a lot: abrasion, the wear from physical scrubbing such as hard brushing, and abfraction, a more debated idea that bite stress flexes the tooth and causes the enamel to break away at the neck. The honest position from the research is that these notches are usually multifactorial, meaning more than one thing is at play.
Key takeaways
- Notches at the gumline are non carious cervical lesions, not cavities.
- Toothbrush abrasion from hard scrubbing is a well established cause.
- Acid wear softens enamel and makes it easier to wear away.
- Abfraction, the bite stress theory, is real but debated and likely one factor among several.
- Most cases are caused by a combination, so management targets each contributing factor.
The three usual suspects
Abrasion (physical wear)
Brushing too hard, using a stiff brush, or a heavy sawing motion can gradually wear a groove into the softer tooth structure near the gumline. This is one of the clearest and most preventable causes, and it often goes hand in hand with gum recession, which exposes the more vulnerable root surface.
Erosion (acid wear)
Acid from fizzy drinks, citrus, wine or reflux softens the enamel surface, which then wears away more easily. When acid and brushing combine, the effect is greater than either alone. Our guides to enamel erosion and acid reflux and teeth cover this in detail.
Abfraction (bite stress)
This is the most debated of the three. The theory is that heavy or grinding bite forces flex the tooth and concentrate stress at the neck, causing tiny amounts of enamel to fracture away. The evidence for abfraction acting alone is limited and comes mainly from laboratory stress models, so most researchers now see it as a possible contributor rather than a sole cause. Grinding and clenching, which a night guard can help manage, may add to the wear.
Why the cause matters
Because these lesions usually have more than one cause, the fix is not a single thing. The table below links common contributors to practical steps.
| Contributor | What helps |
|---|---|
| Hard brushing | Soft brush, gentle technique, electric brush with a pressure sensor |
| Acid in the diet | Limit acidic drinks, wait before brushing after acid, rinse with water |
| Reflux | Manage reflux with your doctor, protect teeth |
| Grinding or clenching | A night guard, stress management |
What can be done about the notch itself?
Small, painless lesions are often just monitored, with attention to the habits causing them. Where a notch is deep, sensitive, or affecting appearance, a tooth coloured filling can restore the area and reduce sensitivity. If the gum has receded significantly, a gum graft may be considered. The most important step, though, is removing the cause, because a filling placed without changing a hard brushing habit can simply wear or fail again. Switching to a soft brush and a gentle technique protects both your teeth and your gums, and helps prevent sensitivity, as our guide to looking after your gums explains.
Frequently asked questions
Is a notch at the gumline a cavity?
No. These are non carious cervical lesions, meaning they are wear rather than decay. They can still become sensitive or trap plaque, so they are worth assessing.
Is abfraction a proven cause?
It is a real but debated idea. The evidence suggests it may contribute in some people, but most gumline notches are caused by a combination of wear, acid and bite forces rather than bite stress alone.
Can I stop them getting worse?
Often yes. Brushing gently with a soft brush, limiting acidic foods and drinks, managing reflux and grinding, and regular checks all help slow or stop the wear.
Why are these teeth sensitive?
The notch exposes dentine, the layer beneath enamel, which is more sensitive to cold, heat and brushing. Desensitising toothpaste and a filling can help.
Do they need filling?
Not always. Shallow, comfortable lesions can be monitored. Deeper, sensitive or visible ones are often restored with a tooth coloured filling.
The takeaway
Notches at the gumline are common wear lesions, not cavities, and they usually have more than one cause: physical abrasion, acid erosion and possibly bite stress. The honest research view is that these factors combine, so the best management tackles each one, starting with a soft brush and a gentle technique. To have gumline wear assessed and protect your teeth, contact the team at Lumi Dental or see our current deals page.
