INTRODUCTION
Plant-based diets have experienced exponential growth globally, driven by health consciousness, environmental concerns, and ethical considerations regarding animal welfare. The spectrum of plant-based eating encompasses various dietary patterns with distinct implications for oral health & dental treatments.
TYPES OF PLANT-BASED DIETS
Veganism:Complete exclusion of all animal products including meat, dairy, eggs, honey, and often animal-derived ingredients in processed foods. This represents the most restrictive form of plant-based eating.
Lacto-Vegetarianism:Excludes meat, poultry, fish, and eggs but includes dairy products, providing natural sources of calcium and vitamin D.
Ovo-Vegetarianism:Excludes meat, poultry, fish, and dairy but includes eggs, offering vitamin B12 and protein sources.
Lacto-Ovo Vegetarianism:Excludes meat, poultry, and fish but includes both dairy and eggs, the most common vegetarian pattern.
Pescatarianism:Excludes meat and poultry but includes fish, seafood, dairy, and eggs, providing omega-3 fatty acids.
Raw Veganism:Consumes only uncooked plant foods not heated above 118°F (48°C), believing this preserves enzymes and nutrients.
IMPACT ON ORAL HEALTH
Dental Erosion: A Primary Concern
The systematic review by Smits et al. (2020) confirmed a 2.4-fold increased risk of dental erosion among vegetarians (OR: 2.40; 95% CI: 1.24-4.66; p = 0.009). Multiple factors contribute to this elevated risk:
High Fruit Consumption: Citrus fruits (oranges, lemons, grapefruits), berries, and tropical fruits contain citric, malic, and ascorbic acids with pH values ranging from 2.0-4.0, well below the critical pH of 5.5 for enamel dissolution.
Fruit Juices: Concentrated fruit juices lack the fiber that slows consumption and provides mechanical cleaning. Sipping acidic beverages prolongs acid contact time with enamel.
Vinegar-Based Foods: Apple cider vinegar drinks, salad dressings, and pickled vegetables contribute to acid exposure. Some health trends promote vinegar consumption for purported benefits, increasing erosion risk.
Fermented Foods: Kombucha, sauerkraut, and other fermented foods have low pH values. While offering probiotic benefits, frequent consumption erodes enamel.
Reduced Calcium Buffering: Dairy products naturally buffer dietary acids through their calcium content. Absence of dairy removes this protective effect from the diet.
Caries Risk Profile
The relationship between plant-based diets and caries is complex. Meta-analysis showed a lower DMFT (Decayed, Missing, Filled Teeth) score in vegetarians compared to omnivores (mean difference: -0.15; 95% CI: -0.29, -0.02; p = 0.023), though this finding became insignificant when only adult studies were included.
Protective factors include reduced sugar intake from processed foods, higher fiber consumption stimulating saliva, and generally healthier lifestyle behaviors. Risk factors include frequent fruit consumption (natural sugars), sticky dried fruits, and reliance on carbohydrate-heavy meat alternatives.
NUTRITIONAL DEFICIENCIES AFFECTING ORAL HEALTH
1.Vitamin B12 Deficiency
Vitamin B12 deficiency represents the most significant oral health concern for vegans. B12 is essential for red blood cell formation, neurological function, DNA synthesis, and cellular metabolism. Since B12 occurs naturally only in animal products (meat, fish, dairy, eggs), vegans have no dietary source without fortification or supplementation.
Oral Manifestations of B12 Deficiency:
Glossitis: Swollen, inflamed, beefy-red tongue with loss of papillae ("bald tongue") causing burning sensation and taste alterations.
Angular Cheilitis: Painful cracks and inflammation at the corners of the mouth, often with secondary candidal infection.
Burning Mouth Syndrome: Chronic burning sensation of oral mucosa without visible lesions.
Recurrent Aphthous Ulcers: Increased frequency and severity of canker sores.
Periodontal Attachment Loss: Studies link low B12 levels with increased loss of adhesive dental tissue and periodontal deterioration.
Recommended intake: 2.4 mcg daily minimum.
Vegan sources: Fortified nutritional yeast, fortified plant milks, fortified cereals, and B12 supplements (cyanocobalamin or methylcobalamin forms).
2.Calcium Deficiency
Calcium forms the structural basis of tooth enamel (hydroxyapatite crystite) and alveolar bone supporting teeth. Inadequate calcium:
compromises enamel strength
reduces remineralization capacity and weakens the periodontal supporting structures.
Recommended Intake:1000-1200 mg daily for adults.
Vegan sources: Fortified plant milks (300mg per cup when fortified), tofu processed with calcium sulfate (250-750mg per serving depending on firmness), leafy greens (kale: 100mg per cup; bok choy: 74mg per cup; broccoli: 43mg per cup), almonds (75mg per ounce), white beans (63mg per half cup), figs (35mg per fig).
Bioavailability Note: Calcium absorption varies by source. Oxalates in spinach and Swiss chard reduce absorption significantly. Kale, bok choy, and broccoli have better bioavailability despite lower total calcium content.
3.Vitamin D Deficiency
Vitamin D facilitates intestinal calcium absorption and has independent anti-inflammatory effects on periodontal tissues. Multiple studies link vitamin D deficiency to increased periodontal disease severity. Without adequate vitamin D, dietary calcium cannot be effectively utilized for enamel and bone health.
Recommended Intake:600-1000 IU daily; higher doses may be needed to achieve optimal serum levels (30-50 ng/mL).
Vegan sources: sun exposure (primary source; 10-30 minutes midday depending on skin tone and latitude), fortified plant milks, fortified orange juice, fortified cereals, mushrooms exposed to UV light, supplements (D2 is plant-derived; vegan D3 from lichen is available).
4.Omega-3 Fatty Acid Deficiency
Omega-3 fatty acids (EPA and DHA) demonstrate anti-inflammatory effects beneficial for periodontal health, modulating the immune response to bacterial challenge. Deficiency may increase susceptibility to inflammatory periodontal destruction.
Recommended:250-500 mg combined EPA/DHA from algae supplements, plus ALA-rich foods daily.
Vegan sources: ALA (alpha-linolenic acid) from flaxseeds, chia seeds, walnuts, hemp seeds, and canola oil. However, conversion of ALA to active EPA and DHA is limited (approximately 5-10% efficiency). Algae-derived DHA and EPA supplements provide direct sources for plant-based individuals.
Free for members
Keep reading — it's free
The rest of this article is open to DentalReach members. Create a free account, or sign in, and every article on the site opens in full.