Denture-related stomatitis, caused predominantly by Candida albicans, affects an estimated 50–65% of complete denture wearers at some point, according to oral health literature. Despite being the most common form of oral candidiasis in the UK, many patients tolerate symptoms without seeking treatment or misattribute them to poor denture fit. Community pharmacists are well placed to identify denture stomatitis, recommend effective antifungal treatment, and — critically — advise on the denture hygiene measures that prevent recurrence.

How Denture Stomatitis Develops

The warm, moist environment beneath a denture creates ideal conditions for Candida colonisation. Biofilm forms on the fitting surface of the denture (the part that contacts the palate or gum ridge), and the fungal organisms then infect the underlying mucosa. Several factors increase risk:

• Wearing dentures continuously, including overnight
• Poor denture hygiene — insufficient cleaning, no overnight soaking
• Dry mouth (xerostomia) — common in older adults and a side effect of many medications including antidepressants, antihistamines, antihypertensives and diuretics
• Systemic factors — diabetes, immunosuppression, recent antibiotic or inhaled corticosteroid use
• Ill-fitting dentures — trauma to the mucosa breaks down the natural barrier to infection

Clinical Presentation

Denture stomatitis typically presents as:

• Redness and soreness of the palate beneath the upper denture (the most common site)
• A burning or uncomfortable sensation, particularly when eating acidic or spicy food
• Occasionally, angular cheilitis — cracking and redness at the corners of the mouth
• White patches are less common than in other forms of oral thrush; the redness alone is often the only sign

Patients may present asking for something for a "sore mouth" or "sore palate" without recognising the connection to their dentures.

Pharmacy Treatment

First-line: Miconazole oral gel (Daktarin)

Miconazole 2% oral gel is available over the counter and is the recommended first-line treatment for denture stomatitis:

• Dose: Apply a small amount (approximately 2.5 ml / half a 5 ml spoon) to the affected area of the mouth four times daily after food
• Duration: Continue for at least 7 days after symptoms resolve — typically 14 days total
• Application tip: Advise the patient to also apply a thin layer of gel to the clean fitting surface of the denture before reinserting

Important drug interaction: Miconazole is a potent inhibitor of CYP2C9 and CYP3A4. It must not be used with warfarin (risk of serious bleeding) or with some statins. Always check the patient's medication history before recommending miconazole oral gel. For warfarin patients, refer to the GP for an alternative antifungal (typically nystatin suspension, which is prescription-only).

Alternative: Nystatin oral suspension (prescription-only)

For patients who cannot use miconazole (warfarin users, known hypersensitivity), nystatin 100,000 units/ml suspension is an effective alternative. This requires a GP prescription. Advise the patient to hold the suspension in the mouth for as long as possible before swallowing.

Denture Hygiene: The Key to Prevention

Antifungal treatment without improved denture hygiene is a temporary fix. Candida biofilm on the denture will reinfect the mucosa within weeks. Pharmacists should counsel every patient presenting with denture stomatitis on the following hygiene protocol:

Sodium hypochlorite soaking is the most effective method for eliminating Candida biofilm from denture surfaces, according to prosthodontic research. Commercially available denture-cleaning tablets (Steradent, Poligrip) typically contain sodium perborate or sodium bicarbonate and are less effective against established biofilm — they are better for maintenance than for active treatment.

When to Refer

Pharmacists should refer patients to their GP or dentist if:

• Symptoms do not improve after 14 days of miconazole treatment and improved denture hygiene
• The patient is immunosuppressed, has uncontrolled diabetes, or is on inhaled corticosteroids (may need investigation for underlying causes)
• There is a painless white patch that does not rub off — this may indicate leukoplakia rather than candidiasis and requires dental assessment
• Angular cheilitis persists despite antifungal treatment (may have a bacterial co-infection requiring topical fusidic acid or a nutritional deficiency — iron, B12, folate)
• The denture is visibly ill-fitting or damaged — dental referral for relining or replacement

Products Pharmacists Can Recommend

• Miconazole 2% oral gel (Daktarin Oral Gel)
• Denture-cleaning solutions (Milton Sterilising Fluid for sodium hypochlorite option)
• Denture brushes
• Corsodyl (chlorhexidine 0.2%) mouthwash — adjunctive antimicrobial, useful during active treatment
• Artificial saliva products (BioXtra, Glandosane) — for patients with dry mouth contributing to recurrence
• Denture fixative (if poor retention is contributing to mucosal trauma)

The Bigger Picture

Oral health in older adults is an area where community pharmacy can make a measurable difference. Many denture wearers do not attend regular dental check-ups, making the pharmacy their primary point of oral health contact. A brief conversation about overnight denture removal and proper soaking can break the cycle of recurrent denture stomatitis that affects millions of UK denture wearers.

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Sources: NICE CKS Oral Candidiasis, British National Formulary, NHS England, British Society of Prosthodontics.