What causes tooth neck wear?

What is tooth neck wear?

I am Dr. Emily Nguyen, Founding Clinical Director of Picasso Dental Clinic. Since 2013, I have treated more than 70,000 patients from 65 nationalities across six branches in Hanoi, Da Nang, Ho Chi Minh City, and Da Lat. Tooth neck wear, known clinically as cervical abrasion or abfraction, is one of the most consistently underdiagnosed conditions I see in new patients, especially those arriving from countries where dental visits are infrequent.

The tooth neck is the narrow zone where the crown meets the root, right at the gumline. This area is anatomically vulnerable: the enamel is thinnest here, tapering to almost nothing at the cemento-enamel junction. Below the gumline, the root surface is covered by cementum, a tissue far softer than enamel. Once gums recede even slightly, this softer surface is directly exposed to brushing forces and acid attack.

The damage appears as a notch or groove at the gumline, often yellowish because the underlying dentine is visible. Patients describe sensitivity to cold water, cold air, sweet foods, or the touch of a toothbrush on that spot. In severe cases, the notch can reach the pulp and require root canal treatment to save the tooth.

The four causes of tooth neck wear

1. Aggressive brushing

Aggressive brushing is by far the most common cause I see across all six branches. Many patients believe vigorous scrubbing equals cleaner teeth. The opposite is true at the gumline. Plaque is soft and requires only light mechanical disruption to remove. What firm horizontal scrubbing does is abrade the very enamel and cementum you are trying to protect.

The pattern of damage from aggressive brushing is distinctive: wedge-shaped notches on the buccal (cheek-facing) surfaces of teeth, most pronounced on the canines and premolars on the dominant-hand side. Right-handed brushers typically show more wear on the upper-left and lower-left teeth, where the brush hand crosses with maximum leverage.

2. Acid erosion as a contributing factor

Acid erosion does not cause tooth neck wear on its own, but it dramatically amplifies brushing damage. Acidic foods and drinks lower the pH of the oral environment, causing temporary softening of enamel through a process called demineralisation. In this softened state, the enamel at the gumline is far more susceptible to mechanical removal by bristles.

Common sources of acid exposure include citrus fruits, fizzy drinks, sparkling water, wine, vinegar, and even apparently healthy habits like lemon water or kombucha in the morning. Patients who start the day with an acidic drink and then brush immediately are compounding the erosive and abrasive damage in a single routine. The 30-minute rule changes outcomes measurably: waiting 30 to 60 minutes after acid exposure allows saliva to remineralise the softened enamel before brushing contacts it.

3. Teeth grinding and clenching (bruxism)

Bruxism creates a different mechanical pathway to tooth neck wear. When teeth grind or clench, the jaw generates enormous forces relative to the size of individual teeth. These forces produce lateral bending stress at the tooth neck, the narrowest and therefore most mechanically stressed part of the tooth. This repeated flexing causes microscopic fatigue fractures in the enamel at the gumline, a lesion type called abfraction.

Once enamel is fractured at the microscopic level, normal brushing forces are sufficient to remove the weakened fragments progressively. Patients with bruxism often develop cervical lesions on multiple teeth simultaneously and symmetrically, which distinguishes the pattern from brushing-only damage. Morning jaw soreness, flattened or chipped incisal edges, and sensitivity on multiple non-adjacent teeth are signs that grinding is contributing to the wear you are seeing.

A custom-fitted occlusal splint (night guard) worn during sleep interrupts the grinding forces before they reach the tooth neck. Combined with addressing the brushing technique, this stops the combined mechanism in most patients. Generic over-the-counter mouthguards do not provide the same precision of fit and do not fully interrupt the flexing stress pattern.

"Emily and the team were amazing and so patient with me. Not once did I feel in pain or discomfort. By far one of the best dentists I have ever been to."

Mina Scott, Hanoi Old Quarter, Google review

4. Gum recession exposing the root surface

Gum recession changes the vulnerability of the tooth neck fundamentally. Above the gumline, the root is protected by enamel. Once gums recede, the cementum-covered root surface is directly exposed. Cementum is softer than enamel by a significant margin: it wears under normal brushing forces at a rate that enamel does not. Even a patient with a gentle technique will develop cervical grooves on exposed root surfaces over time if the recession is not addressed.

Gum recession itself has multiple causes: periodontal disease, aggressive brushing, genetic factors, and the natural ageing process. This creates a compounding effect. Aggressive brushing causes both the cervical abrasion and the gum recession that makes the area more vulnerable to further abrasion. Treating one without addressing the other produces incomplete results.

How to stop tooth neck wear progressing

• Switch to a soft-bristled brush immediately Medium and hard bristles cause direct enamel loss at the gumline regardless of pressure. Soft or extra-soft bristles, used with correct technique, clean as effectively and do not abrade. If your current brush is medium or hard, replace it before the next brushing session.
• Adopt the modified Bass technique Hold the brush at 45 degrees to the tooth surface so the bristle tips sit at the gum margin. Use small circular or vibrating strokes. Do not scrub horizontally. Move slowly through all four quadrants. The goal is two minutes of light contact, not friction.
• Wait before brushing after acid exposure After citrus, fizzy drinks, wine, or any acidic food or beverage, wait a minimum of 30 minutes before brushing. Rinse with plain water immediately after acid exposure to neutralise the oral environment and accelerate remineralisation.
• Wear a night guard if you grind If you wake with jaw soreness, notice flattened tooth surfaces, or have been told by a partner that you grind at night, request a custom occlusal splint. A properly fitted night guard eliminates the abfraction mechanism and protects all cervical surfaces simultaneously.
• Use an electric brush with a pressure sensor Oscillating-rotating and sonic electric toothbrushes with pressure sensors stop or alert you when brushing force exceeds a safe threshold. For patients who have developed excessive pressure as a habit, this external feedback is far more effective than consciously trying to reduce pressure.
• Address gum recession at the source If recession is causing rapid cementum wear, the gum position needs to be stabilised, not just the brushing technique corrected. Periodontal assessment determines whether recession is active and what intervention is appropriate.

Warning signs versus safe habits

Treatment: what happens when wear has already occurred

Once a cervical lesion has formed, prevention alone cannot restore the lost structure. The exposed dentine must be covered to reduce sensitivity, prevent further wear, and protect the pulp from chemical irritation and bacterial ingress.

The standard treatment is a tooth-coloured composite resin restoration bonded directly to the notched area. The procedure does not require drilling in most cases because the lesion shape provides adequate mechanical retention. Local anaesthesia is often unnecessary for shallow lesions, though I offer it for any patient who experiences sensitivity during the procedure. The restoration is shaped to match the tooth anatomy, polished, and adjusted for bite. Most patients notice an immediate reduction in cold sensitivity.

For lesions that are very deep, very wide, or located on teeth with significant recession, I may recommend a different approach: glass ionomer cement, which bonds chemically to dentine and releases fluoride to support the surrounding root surface. Some cases also benefit from addressing the gum recession directly before or alongside the restorative work, to create a stable, protected environment for the restoration.

"No more food traps from my own teeth due to age, wear and tear, no recessed gumline, I imagine less sensitivity due to how well they fit at my gum line. I feel a million dollars."

Susie Miller, HCMC Thao Dien, Google review

Cost of cervical abrasion treatment: Vietnam versus international

Tooth neck wear is one of the most cost-sensitive treatments in restorative dentistry. Because many patients require multiple restorations simultaneously, across several teeth, the total cost at home-country rates can be substantial. Vietnam offers significant savings without any change in material quality.

All figures are approximate. Picasso Dental provides written cost estimates before any treatment begins. Patients with multiple cervical lesions commonly complete all restorations in a single visit, eliminating the need for multiple appointments.