Mouth Care for Hospital Patients: Why It Prevents Pneumonia and How to Do It Well

Mouth care is one of the most basic nursing tasks, and one of the most often missed on busy wards. Yet poor oral hygiene allows harmful bacteria to build up in dental plaque, which can be aspirated into the lungs. Research links better oral care to lower rates of hospital-acquired pneumonia, including non-ventilator pneumonia in frail older patients. Good mouth care also helps patients eat, speak and feel comfortable and dignified.

Who is at risk?

• Patients who are dependent for personal care, frail, or have dementia.
• Patients who are nil by mouth, on oxygen, or mouth-breathing.
• People with swallowing difficulties after stroke.
• Ventilated and unconscious patients.
• Patients on chemotherapy or radiotherapy (mucositis).
• People with diabetes, dehydration, or on medicines that dry the mouth.
• Patients at the end of life.

Assessment

Assess the mouth on admission and regularly: lips, tongue, gums, teeth, dentures, saliva, any pain, ulcers, white patches (possible thrush), bleeding, or difficulty eating. Many hospitals use a structured oral health assessment tool. Ask about the patient’s usual routine and needs.

Daily mouth care for dependent patients

1. Explain; position the patient upright (or on their side if they can’t sit up) to reduce aspiration risk.
2. Hand hygiene and gloves.
3. Brush teeth at least twice a day with a soft, small-headed toothbrush and a pea-sized amount of fluoride toothpaste. Brush gently along the gum line and tongue.
4. Encourage spitting rather than rinsing (unless the patient can’t spit); use suction if needed.
5. Moisturise lips with a water-based lubricant (avoid petroleum-based products near oxygen).
6. Offer fluids if safe to swallow.
7. Document care and any problems.

Foam swabs are not effective at removing plaque and shouldn’t replace toothbrushing; their heads can detach and be a choking risk.

Dentures

• Remove and clean dentures daily with a brush and soap or denture cleaner; rinse well.
• Leave them out overnight (if the patient agrees), stored in a labelled container with water.
• Lost dentures are a common, distressing problem in hospital: label them and record them on admission.
• Check that dentures fit; poorly fitting dentures can stop patients eating.

Ventilated patients

Oral care is part of ventilator care bundles in ICUs: toothbrushing, suctioning of oral secretions, head-of-bed elevation, and moisturising. Practices around chlorhexidine mouthwash vary; follow your unit’s protocol.

Common problems

• Dry mouth: frequent sips, mouth moisturisers, review medicines.
• Oral thrush (white patches): report for antifungal treatment.
• Mucositis in cancer treatment: gentle care, prescribed mouthwashes, pain relief.
• Ulcers and bleeding gums: report and investigate.

At the end of life

A dry, coated mouth is one of the most uncomfortable symptoms for dying patients. Frequent gentle mouth care (moistening the mouth and lips every 1–2 hours) is a meaningful comfort, and families often appreciate being shown how to help. See our palliative care guide.

Related: Pneumonia care plan · Stroke and swallowing

Based on NICE NG48 (Oral health for adults in care homes), the Mouth Care Matters programme (Health Education England) and published evidence on oral care and hospital-acquired pneumonia. Educational content.