Nutrition and Oral and Dental Health Disorders

Oral and Dental Health: Nutritional Aspects and Disorders

Introduction to Oral and Dental Health

  • There is a significant synergy between nutrition and oral health.
    • Nutrition status and food intake directly impact the oral cavity.
    • Ability to chew and swallow directly affects the types of food an individual can consume.

Anatomy of a Tooth

  • Hydroxyapatite: The hard, white outer part of the tooth, similar to bone. It is composed of calcium phosphate crystals.
    • Nutritional Relevance: Adequate calcium and vitamin D are crucial for both bone and dental health.
    • Fluoride's Role: Topical fluoride stabilizes these crystals, forming fluoroapatite, which protects the enamel.
  • Dentin: The main part of the tooth, underlying the enamel, and surrounding the pulp.
    • Contains a high amount of collagen protein.
    • Nutritional Relevance: Vitamin C is vital for collagen synthesis; thus, scurvy (vitamin C deficiency) can cause painful and bleeding gums.
  • Pulp: The soft, innermost part of the tooth, supplied by nerves (responsible for toothache sensation).

Dental Caries (Tooth Decay or Cavities)

  • Definition: Medical term for tooth decay or cavities.
  • Prevalence: Among the most common infectious diseases globally.
  • Etiology (Infectious Disease):
    • Involves bacteria; the most prevalent in the mouth is Streptococcus mutans (though many others exist).
    • These bacteria metabolize carbohydrates in the mouth.
    • Byproduct: They produce acid, primarily lactic acid (similar to anaerobic glycolysis end product).
    • This acid causes demineralization and tooth decay.
  • Favored Foods for Bacteria: Fermentable carbohydrates, which salivary amylase (ptyalin) can break down into glucose for bacteria to metabolize.
    • Examples: Sugary and starchy foods (candy, cookies, crackers, potato chips).
  • Role of Saliva (Protective Mechanism):
    • Alkaline Nature: Maintains oral pH at approximately 5.5, inhibiting tooth decay.
    • Antimicrobial Agents: Contains lysozyme and other agents, enhancing protection.
    • Washing Action: Physically washes over teeth, preventing caries.
    • Xerostomia (Dry Mouth): Individuals with dry mouth are more susceptible to dental caries due to reduced saliva protection.
  • Plaque and Tartar Formation:
    • When sugars are not cleaned off teeth, bacteria feed on them, producing acids.
    • Bacteria, acids, food particles, and saliva combine to form dental plaque, a sticky, usually invisible film on teeth.
    • Plaque combines with calcium and hardens into tartar, which dental hygienists scrape off.
  • Progression of Decay:
    • Acids in plaque cause demineralization of hydroxyapatite crystals in the enamel.
    • Eventually, the dentin and pulp can become exposed.
    • Continued bacterial and acid progression through tooth layers leads to pain if nerves are reached.
    • Infection of the pulp can cause swelling, inflammation, white blood cell response, pus, swelling, and an abscessed tooth.

Fluoride: Mechanism, Sources, and Controversies

  • Mechanism of Action: Fluoride (ionic form of fluorine with an extra electron, giving it a negative charge) interacts with calcium phosphate crystals of hydroxyapatite to form fluoroapatite.
    • Fluoroapatite is more resistant to acid challenge than hydroxyapatite, thus stabilizing enamel and preventing demineralization.
  • Sources: Trace element naturally present in small amounts in various foods.
    • Primary exposure: Fluoridated toothpaste, mouthwash, and drinking water.
  • Water Fluoridation:
    • Began in the 1940s; the CDC названа одним из топ 10 достижений общественного здравоохранения 20-го века.
    • At-Risk Populations for Deficiency: Older adults born before widespread fluoridation, those in rural areas drinking unfluoridated well water, or individuals consuming mainly bottled water (which lacks fluoride).
  • Controversy and Toxicity:
    • Fluoride is toxic at high doses, with symptoms like nausea, vomiting, and diarrhea.
    • Levels in water fluoridation are very low and far below toxic amounts.
  • Dental Fluorosis:
    • Definition: A cosmetic change in tooth enamel appearance, ranging from barely noticeable white spots to mild staining or pitting.
    • Cause: Occurs when children consume too much fluoride over a long period while teeth are developing under the gums.
    • Recommendations (American Dental Association - ADA): Children younger than approximately 8 years old should not use fluoridated mouthwashes/toothpastes. Parents should supervise brushing to ensure a pea-sized amount of toothpaste is used and not swallowed.
    • Infant Formula: Breast milk is naturally low in fluoride. Using tap water to reconstitute powdered infant formula can increase the risk for mild fluorosis, but the CDC considers it not a major concern and generally cosmetic.

Gingivitis and Periodontal Disease

  • Gingiva: Medical term for the gums.
  • Gingivitis: Inflammation of the gums, often a precursor to periodontal disease.
  • Periodontal Disease: Diseases affecting the tissues that support and anchor the teeth.
    • Consequence: If untreated, can lead to tooth loss (edentulism).
    • Etiology: Like dental caries, the underlying cause is dental plaque.
    • Prevalence: As many as 40\% of older adults in America are edentulous.
    • Implications: Dental work is expensive and often not covered by health insurance (e.g., Medicare), leading many to choose tooth extraction. Dentures/partial dentures may not always be optimal.

Prevention and Nutritional Management for Oral Health

  • Primary Prevention: Fluoridation, good oral hygiene, and good nutrition.
  • Cariogenic vs. Cariostatic Foods:
    • Cariogenic Foods: Promote tooth decay.
      • Examples: Fermentable carbohydrates like candy, cookies, crackers, potato chips.
      • Carbonated Beverages: Even diet sodas are cariogenic due to their acidity, despite being sugar-free.
    • Cariostatic Foods: Do not promote tooth decay.
  • Baby Bottle Tooth Decay: Can occur if a child is put to bed with a bottle or sippy cup containing sugary liquids (e.g., juice).
  • Protective Agents/Practices:
    • Baking Soda: In toothpastes, acts as an alkaline agent to neutralize acids.
    • Xylitol: A nonfermentable sugar alcohol used as an artificial sweetener (e.g., in sugarless chewing gums). It is protective against dental caries. A piece of sugar-free gum can be a good alternative if brushing after a meal is not possible.
  • Nutritional Deficiencies and Oral Health Risk:
    • Protein and Vitamin C: Essential for collagen formation.
    • Zinc: Needed for tissue repair.
    • Vitamin D and Calcium: Important for strong enamel and bones.
    • Micronutrient Deficiencies: Can often be first detected by changes in the oral cavity due to the rapid turnover of oral mucosa tissue.
    • Compromised Immune System: Poor nutrition can weaken the immune system, reducing the body's ability to fight off infections like dental caries and periodontal disease.
  • Management of Periodontal Disease (Nutritional Support):
    • Ensure adequate intake of all micronutrients, energy, and protein.
    • May require modification of food consistency, temperature, and texture.
    • Pre- and post-operative diets are crucial for healing following oral surgery.
    • Blood Glucose Control: Hyperglycemia (poorly controlled diabetes) is linked to various oral health problems, including periodontal disease, dental caries, dry mouth, candidiasis (thrush), and burning mouth syndrome.

Dentition and Considerations for Older Adults

  • Edentulism in Older Adults: Assessment of dentition is a critical part of nutrition assessment for older adults.
  • Denture Challenges: Dentures may not fit well due to weight changes or alterations in alveolar bone over time.
    • Even with full dentures, individuals may struggle with foods like meats, hard fruits/vegetables, and chewy breads/rolls.
  • Dietary Recommendations: Focus on soft protein foods (eggs, yogurt, cottage cheese) and soft fiber foods (applesauce, canned vegetables).
    • Practical Advice: Rinse canned vegetables to reduce sodium. Prioritize consuming canned vegetables over no vegetables. Blended smoothies are excellent for ease of consumption.

Other Oral Disorders

  • Stomatitis: Inflammation of the oral mucosa (lining of the mouth).
    • Symptoms: Painful, causes difficulty eating.
    • Causes: Autoimmune diseases (e.g., lupus), radiation therapy for head and neck cancers.
  • Glossitis: Inflammation of the tongue.
    • Symptoms: Swollen, red, smooth tongue.
    • Causes: Symptom of iron deficiency or deficiencies in B vitamins (e.g., B12).
  • Angular Cheilitis (Cheilosis): Fissures or cracks at the corners of the mouth.
    • Signature Sign: Riboflavin deficiency.
    • Also indicates iron deficiency.
  • Dietary Management for Painful Oral Conditions:
    • Avoid acidic, salty, or spicy foods.
    • Use a straw to direct fluids away from painful areas.
    • Numb the mouth with ice chips or popsicles.
  • Candidiasis (Oral Thrush): Fungal infection caused by Candida albicans.
    • Requires antifungal medication for treatment.
    • Correct any underlying micronutrient deficiencies (e.g., riboflavin, B12, iron).

Xerostomia (Dry Mouth)

  • Definition: Dryness of the mouth due to reduced or absent saliva flow.
  • Causes:
    • Inadequate hydration is a primary assessment point.
    • Poorly controlled diabetes, radiation therapy.
    • Sjögren's Disease: An autoimmune disorder characterized by dry eyes and dry mouth.
    • Medications: A significant number of medications can cause dry mouth (polypharmacy is a culprit, especially in older adults).
  • Impact: Affects all aspects of eating by reducing food moistening and ease of swallowing, significantly increasing the risk of dental caries (due to lack of washing action, reduced alkalinity, and antimicrobial agents).
  • Avoidance: Sucking on hard candy or adding candy to water to stimulate saliva is not recommended as it creates an acidic environment that worsens dental caries, especially with already reduced saliva.
  • Management Strategies:
    • Use sugar-free hard candy, sugar-free popsicles, or ice chips.
    • Frozen grapes or citrus can be used, but require diligent oral hygiene.
    • Moisten foods with broths, gravies, or soups.
    • Saliva Substitutes: Products like Salagen (prescription) or over-the-counter mouthwashes like Biotene.
    • Avoid alcohol-containing mouthwashes, as they can exacerbate dry mouth.

Dysgeusia (Altered Taste)

  • Definition: Altered taste perception.
  • Causes: A common complication of polypharmacy (multiple medications), particularly in older individuals.
  • Specific Taste Alterations: Several medications can cause a metallic taste.
  • Management Strategies:
    • Suggest plastic utensils instead of stainless steel flatware.
    • Encourage eating foods at room temperature rather than very hot or cold.

This discussion sets the stage for the next topic: dysphagia (difficulty swallowing).