Dental Erosion: GERD, Dietary Acids, and Clinical Management Strategies

Dental erosion, defined as the irreversible loss of dental hard tissue by a chemical process not involving bacteria, has emerged as a significant clinical challenge in contemporary dentistry. Unlike caries, which is a site-specific disease mediated by bacterial biofilm, erosion affects entire tooth surfaces and is driven by acids of intrinsic or extrinsic origin. The rising prevalence of erosion, particularly among young adults and adolescents, reflects changing dietary patterns and increased awareness of conditions such as gastroesophageal reflux disease (GERD).

Etiology: The Chemical Basis of Erosion

The fundamental mechanism of dental erosion is the dissolution of hydroxyapatite crystals by hydrogen ions. The critical pH for enamel dissolution is approximately 5.5, below which the oral environment becomes undersaturated with respect to hydroxyapatite, driving mineral loss. For dentin, the critical pH is higher, approximately 6.0-6.5, making exposed dentin more vulnerable to erosion than enamel.

Erosive challenges can be classified by acid source:

Extrinsic Acids

Dietary acids are the most common extrinsic source. Carbonated soft drinks, sports drinks, energy drinks, citrus fruits and juices, wine, cider, and vinegar-based foods all have low pH values. Cola beverages typically have a pH of 2.3-2.5, similar to gastric acid. The titratable acidity, or buffering capacity, of a beverage is a more important determinant of its erosive potential than pH alone, as it determines how much saliva is required to neutralize the acid.

Frequency and pattern of consumption are as important as the nature of the acidic substance. Sipping an acidic drink over an extended period creates a sustained low pH in the oral cavity, overwhelming the buffering capacity of saliva. Swishing or holding acidic beverages in the mouth before swallowing accelerates the erosive process. Nighttime consumption is particularly damaging because salivary flow is reduced during sleep.

Occupational and environmental exposures represent less common but potentially severe extrinsic sources. Workers in battery manufacturing, galvanizing plants, and fertilizer production may be exposed to airborne acids. Competitive swimmers who train extensively in poorly maintained, over-chlorinated pools are at risk for enamel erosion. Wine tasters, who swish wine extensively throughout the day, represent a classic occupational risk group.

Intrinsic Acids

Gastroesophageal reflux disease is the most significant intrinsic source of dental erosion. GERD is characterized by the retrograde flow of gastric contents into the esophagus and oral cavity. Gastric acid has a pH of 1.0-2.0, making it extremely erosive when it contacts tooth surfaces. The typical pattern of GERD-related erosion affects the palatal surfaces of maxillary anterior teeth and the occlusal surfaces of posterior teeth.

Prevalence estimates suggest that 20-40% of the adult population in Western countries experiences GERD symptoms at least weekly. Among patients with diagnosed GERD, the prevalence of dental erosion ranges from 24% to 60%, depending on the study population and diagnostic criteria. Notably, silent GERD, in which patients experience reflux without typical heartburn or regurgitation symptoms, may first be identified through dental findings.

Eating disorders, particularly bulimia nervosa and binge eating disorder with purging, involve repeated vomiting that exposes teeth to gastric acid. The characteristic erosion pattern in these patients affects the palatal surfaces of maxillary anterior teeth and, unlike GERD, typically spares the mandibular teeth, which are protected by the tongue during vomiting. Anorexia nervosa may also contribute to erosion through dietary choices, such as consuming large quantities of acidic, low-calorie beverages and citrus fruits.

Other intrinsic sources include pregnancy-related hyperemesis gravidarum, chronic alcoholism with associated vomiting, and rumination syndrome in which food is repeatedly regurgitated and re-chewed.

Clinical Features and Diagnosis

Early erosion appears as a smooth, shiny enamel surface with loss of normal surface characteristics, including perikymata and developmental ridges. The affected areas may appear glazed or frosted. As erosion progresses, enamel is lost in a characteristic cupped or scooped-out pattern, most commonly on the occlusal surfaces of posterior teeth and the palatal surfaces of anterior teeth.

In advanced cases, enamel is completely lost, exposing the underlying dentin, which appears yellow and may be sensitive. Amalgam or composite restorations may appear raised above the surrounding tooth surface (amalgam islands) because the restoration material resists erosion while the surrounding tooth structure dissolves. Incisal edges become thin, translucent, and susceptible to chipping.

Differentiating erosion from other forms of tooth wear (attrition, abrasion, abfraction) requires careful clinical examination and history-taking. Erosion lesions are typically smooth, rounded, and broad-based, in contrast to the flat, sharp-edged facets of attrition. A detailed dietary and medical history, including questions about reflux symptoms, eating habits, and exposure to acidic beverages, is essential. Validated questionnaires such as the GerdQ can aid in screening for GERD.

The BEWE Index

The Basic Erosive Wear Examination (BEWE) was introduced by Bartlett et al. in 2008 as a simple, reproducible scoring system for recording the severity of erosive tooth wear. The dentition is divided into sextants, and the most severely affected tooth in each sextant is scored on a 0-3 scale:

• BEWE 0: No erosive tooth wear
• BEWE 1: Initial loss of surface texture
• BEWE 2: Distinct defect, hard tissue loss affecting less than 50% of the surface area
• BEWE 3: Hard tissue loss affecting 50% or more of the surface area

The cumulative BEWE score (sum of all sextant scores) guides management:

• Cumulative score less than or equal to 2: No treatment needed beyond routine maintenance and dietary advice
• Score 3-8: Moderate wear, requiring dietary analysis, preventive measures, and consideration of direct restorations
• Score 9-13: Severe wear, requiring restorative intervention, possibly including indirect restorations
• Score 14 or above: Very severe wear, requiring complex multidisciplinary rehabilitation

The BEWE has been validated in multiple populations and is recommended by the European Federation of Conservative Dentistry for routine clinical use. Photographic documentation of BEWE scores facilitates longitudinal monitoring and patient communication.

Preventive Management

The first priority in managing dental erosion is identifying and addressing the underlying acid source. For patients with extrinsic erosion from dietary acids, behavioral modification is essential. Dietary counseling should emphasize: reducing the frequency and duration of acidic beverage consumption; using a straw to direct acidic drinks away from teeth; rinsing with water or milk immediately after acid exposure; and avoiding toothbrushing for at least 30-60 minutes after an acidic challenge, as the softened enamel surface is vulnerable to abrasion.

For patients with GERD, effective medical management of reflux is the cornerstone of erosion prevention. Proton pump inhibitors (PPIs) such as omeprazole and esomeprazole suppress gastric acid production and reduce the erosive potential of refluxate. Lifestyle modifications include elevating the head of the bed, avoiding meals within 3 hours of bedtime, weight loss for overweight patients, and avoidance of trigger foods (fatty foods, chocolate, caffeine, alcohol, spicy foods).

Dental preventive measures focus on enhancing the resistance of tooth surfaces to acid challenges. Fluoride therapy is the most evidence-based approach. High-concentration fluoride agents, including 5000 ppm prescription fluoride toothpaste, 1.1% sodium fluoride gel, and 5% sodium fluoride varnish, promote the formation of fluorapatite, which is more acid-resistant than hydroxyapatite. Fluoride also has the important property of reducing the critical pH for enamel dissolution from 5.5 to approximately 4.5 when fluorapatite is present on the tooth surface.

Stannous fluoride and sodium fluoride varnishes create a protective surface layer that provides a physical barrier against acid. Studies have shown that professional fluoride varnish application every 3 months significantly reduces erosive wear progression in high-risk patients.

Remineralization and Biomimetic Approaches

Beyond fluoride, several remineralization and biomimetic technologies have been developed to combat erosion:

Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP), marketed as Recaldent and incorporated into products such as GC Tooth Mousse, delivers bioavailable calcium and phosphate ions to the tooth surface. The CPP stabilizes calcium and phosphate in an amorphous, soluble form, maintaining supersaturation at the tooth surface and promoting remineralization. Meta-analyses have shown that CPP-ACP reduces erosive wear when applied regularly, though the effect is modest and requires frequent application.

Bioactive glasses containing calcium sodium phosphosilicate, such as NovaMin, release calcium and phosphate ions upon contact with saliva, forming a hydroxycarbonate apatite layer on the tooth surface. These products have been incorporated into toothpaste formulations and professional desensitizing agents.

Self-assembling peptide P11-4 (Curodont Repair) is a biomimetic technology that diffuses into early carious and erosive lesions, where it assembles into a three-dimensional scaffold that mimics the enamel matrix. This scaffold attracts calcium and phosphate ions from saliva, guiding the formation of new hydroxyapatite crystals within the lesion. While developed primarily for caries, initial studies suggest potential applicability to erosive lesions.

Restorative Management

When erosion has progressed to the point of significant tissue loss, sensitivity, or aesthetic compromise, restorative intervention becomes necessary. The choice of restorative technique depends on the extent and location of tissue loss.

For localized erosion with cupping or scooping of occlusal surfaces, direct composite resin restorations provide a conservative, cost-effective solution. The adhesive protocol is critical: etch-and-rinse adhesives generally achieve higher bond strengths to eroded dentin than self-etch systems, as the acidic pretreatment removes the hypermineralized surface layer that forms on eroded dentin.

For more extensive erosion requiring full-coverage restorations, the choice between direct and indirect techniques involves several considerations. The Dahl concept, originally developed for localized anterior tooth wear, has been adapted for generalized erosive wear. The principle involves creating space for restorative material by placing restorations in supra-occlusion at an increased vertical dimension of occlusion (VDO). Over time, compensatory eruption of posterior teeth and intrusion of anterior teeth re-establishes posterior occlusion, providing the necessary interocclusal space. This approach avoids the need for extensive tooth preparation and maintains more tooth structure.

Indirect restorations, including lithium disilicate and zirconia, are indicated for severe erosion where direct restorations are insufficient. Full-mouth rehabilitation at an increased VDO using ceramic restorations requires careful occlusal analysis, a diagnostic wax-up, and often a transitional phase with provisional restorations to confirm patient adaptation to the new vertical dimension.

Monitoring and Long-Term Maintenance

Erosive tooth wear is a chronic, progressive condition that requires ongoing monitoring. Study models and standardized clinical photographs taken at regular intervals allow objective assessment of wear progression. The BEWE index can be recorded at each recall visit to quantify changes.

For restored teeth, the interface between restoration and tooth structure is a vulnerable zone. Continued acid exposure can lead to marginal degradation, secondary caries, and restoration loss. Patients with ongoing intrinsic acid exposure (GERD, eating disorders) require more frequent recall intervals and meticulous attention to preventive measures.

The prognosis of restorative treatment for erosion depends fundamentally on control of the underlying etiology. Restorations placed in an environment of ongoing acid exposure have a limited lifespan regardless of the material or technique used. Comprehensive management must integrate dental care with appropriate medical management of the underlying condition.

Conclusion

Dental erosion represents a growing clinical challenge driven by dietary factors, the increasing prevalence of GERD, and greater clinical awareness. Successful management requires a systematic approach: identifying and addressing the source of acid exposure, implementing preventive measures to protect tooth surfaces, and providing appropriate restorative care when tissue loss has occurred. The BEWE index provides a standardized framework for assessment and treatment planning. Close collaboration between dentist and physician is essential for patients with intrinsic acid exposure from GERD or eating disorders. As with all chronic conditions, long-term monitoring and maintenance are the foundations of sustained success.