An abrasion lesion is a non-carious loss of tooth structure caused by mechanical friction from an external source, typically an abrasive material or object. Unlike attrition, which results from tooth-to-tooth contact, abrasion involves an exogenous agent — most often a toothbrush — gradually wearing away the hard tissues of the tooth over time.

Common Causes

The cervical area of the tooth — where enamel tapers to meet cementum — is the most vulnerable site for abrasion lesions because the enamel layer is thinnest at this junction. Contributing factors include:

• Aggressive horizontal toothbrushing: The most frequently cited cause, particularly when combined with excessive lateral pressure.
• Hard-bristled toothbrushes: Stiffer bristles concentrate mechanical forces directly on the delicate cervical region.
• Highly abrasive toothpastes: Products with elevated relative dentin abrasivity (RDA) values accelerate tissue loss when paired with improper technique.
• Parafunctional oral habits: Repeatedly biting fingernails, holding pins between the teeth, or similar behaviors can create localized, site-specific lesions.
• Occupational exposure: Workers in dusty environments and musicians who hold certain wind instruments between their teeth may develop characteristic abrasion patterns.

Clinical Significance

Abrasion lesions most often present as smooth, polished, wedge-shaped or dish-shaped notches at the gingival margin. As the lesion deepens, the underlying dentin becomes exposed. Dentin is far more permeable than enamel and contains microscopic tubules that transmit stimuli directly to the pulp, which explains why patients frequently report dentinal hypersensitivity — sharp, transient pain triggered by cold temperatures, heat, or tactile contact.

Progressive abrasion can also compromise the structural integrity of the cervical tooth, create plaque-retentive contours that complicate daily oral hygiene, and raise aesthetic concerns, particularly on visible anterior teeth.

Diagnosis and Management

Clinicians distinguish abrasion from erosion — which results from acid dissolution of enamel — and from attrition by evaluating lesion location, morphology, and surface texture. A smooth, polished surface confined to the cervical region strongly supports a mechanical, abrasive etiology. Management centers on eliminating or modifying the causative factor: patients are counseled on a gentle circular or Bass brushing technique, transitioned to a soft-bristled brush, and guided toward toothpastes with lower abrasivity ratings. When sensitivity is significant or structural loss is substantial, restorative options such as glass ionomer cement or composite resin can shield the exposed dentin and restore natural tooth contour.

Catching and correcting the causative habit early is the most effective way to halt lesion progression and avoid the need for more complex restorative treatment down the line.