Denture Cleaning: Clinical Guide
A clinical reference on denture hygiene protocols, biofilm management, and patient support strategies.
Biofilm, Bacterial Load and Health Considerations
Dentures provide an additional surface within the mouth where plaque biofilm can accumulate. Acrylic resin is hard, non-shedding and can be microscopically porous, and surface scratches or irregularities may increase areas where microorganisms can adhere. The fitting surface of the denture is particularly important because it sits directly against the oral mucosa and may be more difficult for patients or carers to clean effectively.
Denture plaque commonly contains mixed oral microorganisms, including bacteria and yeasts such as Candida species. Candida is frequently involved in denture stomatitis; however, denture stomatitis is multifactorial and may also involve bacterial plaque, trauma, denture-wearing habits, reduced salivary flow, systemic health factors and oral hygiene practices. Poor denture hygiene and continuous denture wearing have been associated with increased plaque accumulation and mucosal inflammation.
In older or medically vulnerable patients, denture plaque may have broader health implications. Dentures can act as a reservoir for microorganisms, including potential respiratory pathogens, and poor oral hygiene has been associated with pneumonia risk in older adults. This risk is particularly relevant for residents with dysphagia, reduced salivary flow, cognitive impairment, dependence with oral care, immunosuppression, or limited ability to remove and clean dentures independently.
Denture cleanliness should be assessed and documented during denture reviews, particularly in residential aged care settings. Where plaque accumulation is present, tailored denture hygiene instruction, overnight denture removal where appropriate, and regular professional review may help reduce denture-related inflammation and support safer oral care.
References
- Budtz-Jørgensen E. Ecology of Candida-associated denture stomatitis. Microbial Ecology in Health and Disease. 2000;12(3):170–185. doi:10.1080/089106000750051846
- Mylonas P, Afzal Z, Attrill DC. A clinical audit of denture cleanliness in general dental practice undertaken in the West Midlands. British Dental Journal. 2014;217:231–234. doi:10.1038/sj.bdj.2014.757
- Iinuma T, Arai Y, Abe Y, et al. Denture wearing during sleep doubles the risk of pneumonia in the very elderly. Journal of Dental Research. 2015;94(3 Suppl):28S–36S. doi:10.1177/0022034514552493
- Takeuchi K, Izumi M, Furuta M, et al. Denture wearing moderates the association between aspiration risk and incident pneumonia in older nursing home residents: a prospective cohort study. International Journal of Environmental Research and Public Health. 2019;16(4):554. doi:10.3390/ijerph16040554
Recommended Cleaning Protocol
1. Rinse
Remove dentures and rinse under lukewarm running water to dislodge loose debris and food particles. Rinse after every meal where possible.
- Never use hot or boiling water as it will distort acrylic resin and compromise fit.
2. Apply Cleaner
Apply a denture-specific cleanser or mild dish soap with a soft-bristled denture brush. Conventional fluoride toothpaste is contraindicated as the abrasive content will scratch the acrylic surface, promoting biofilm retention.
- Avoid whitening products and bleach-based agents, which can damage the prosthesis structure.
3. Brush All Surfaces
Brush all fitting and polished surfaces including the palate, flanges, and occlusal surfaces using gentle circular motions. Pay particular attention to clasps and attachments where biofilm accumulates preferentially.
- Excessive force can cause scratches that harbour bacteria. Clasps should be brushed carefully to avoid distortion.
4. Rinse Thoroughly
Rinse all surfaces under lukewarm running water to remove all residual cleansing agent before reinsertion.
5. Overnight Removal
Overnight removal is generally recommended to allow mucosal tissues to recover and reduce the period of Candida contact. However, this should be based on individual clinical need. Some patients require their dentures to remain in situ at night for correct positioning of a CPAP or mandibular advancement device used for sleep apnoea. Follow manufacturer instructions if a soaking solution is used. Discuss overnight wear with the treating prosthetist.
6. Morning Reinsertion Routine
Before reinserting dentures, rinse them under running water. The patient should also brush the oral mucosa, palate, tongue, and gingival ridges with a soft toothbrush to reduce mucosal bacterial load and stimulate circulation.
Cleaning Frequency
Daily
- Mechanical brushing at least twice daily
- Rinse after meals
- Overnight removal and soaking
- Oral mucosal hygiene before reinsertion
Weekly
- Deep clean with effervescent denture tablets
- Inspect for cracks, fractures, or wear
- Check clasp integrity and adaptation
Periodic Review
- Professional review every 6 to 12 months
- Denture Cleanliness Index (DCI) assessment at each review
- Assess mucosal health and prosthesis fit
Ultrasonic Cleaners for Patients with Dexterity Impairment
For patients with reduced manual dexterity due to conditions such as rheumatoid arthritis, Parkinson's disease, post-stroke motor deficits, or advanced frailty, mechanical brushing may be inadequate or not feasible. Ultrasonic denture cleaners use high-frequency sound waves to generate cavitation bubbles that disrupt and dislodge biofilm from all denture surfaces without requiring fine motor control. Evidence supports their use as an adjunct to, rather than a replacement for, manual cleaning where possible. They are widely available over the counter. Recommending an ultrasonic cleaner is a practical, low-cost intervention that can significantly improve denture hygiene outcomes for this patient group.