Elderly Patient with Dry Mouth and Rampant Caries
A 76-year-old woman attends for a routine check. She lives alone, takes multiple medications including amlodipine, furosemide, and an antidepressant, and has a history of Sjögren's syndrome. She reports a dry mouth, difficulty swallowing dry food, and a recent change in her ability to taste. On examination she has generalised cervical caries on several teeth, root caries on the lower premolars, and a coated tongue. Her plaque control is fair but she struggles to brush the posterior teeth due to arthritis in her hands. She drinks frequent cups of tea with sugar and sucks sugar-free lozenges for her dry mouth. She has not seen a dentist for three years.
1. Identify the key risk factors for her caries and explain how they interact.
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Risk factors and their interaction:
- Xerostomia (Sjögren's + polypharmacy) - reduced saliva means loss of buffering, remineralisation, and antimicrobial protection. This is the dominant driver and multiplies the effect of every other factor.
- Frequent sugar exposure - sugared tea throughout the day creates repeated acid challenges that her saliva cannot buffer.
- Root surface exposure - gingival recession with age exposes cementum, which is softer and more caries-prone than enamel.
- Reduced dexterity (arthritis) - poor plaque removal on posterior teeth leaves stagnation sites.
- Time since last visit - three years without professional care means lesions have progressed unchecked.
- Medications - furosemide and antidepressants contribute to dry mouth; amlodipine can cause gingival changes.
Interaction: Dry mouth alone is manageable; dry mouth plus frequent sugar plus exposed roots plus poor cleaning is a compounding cascade. Addressing only one factor (e.g. telling her to cut sugar) will fail because the others remain.
2. Outline a practical, prioritised prevention and management plan that accounts for her dexterity and living situation.
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Prioritised plan - address the dominant drivers first:
1. Saliva (highest impact):
- Review medications with her GP - can the antidepressant or diuretic be changed? This is often the single most effective intervention.
- Saliva substitutes or sugar-free chewing gum; consider a high-fluoride toothpaste (5,000 ppm) and a fluoride mouthwash.
- Refer to a specialist if Sjögren's is active and symptomatic.
2. Sugar frequency:
- Switch tea to sugar-free; reduce to mealtimes only. Emphasise frequency over amount.
- Continue sugar-free lozenges (these are fine) but avoid sugared drinks between meals.
3. Plaque control adapted to her dexterity:
- Electric toothbrush with a large handle, or a modified grip; consider an interdental brush with a handle.
- Chlorhexidine or fluoride varnish professionally applied.
4. Restorative and review:
- Stabilise active root caries with glass ionomer or fluoride-releasing restorations; consider silver diamine fluoride for arrested lesions where appropriate.
- Recall at 3 months initially, not 6–12.
- Involve a hygienist and, if possible, a carer or family member to support daily cleaning.
5. Communication: write to her GP about the medication review and dry mouth.