A nurse is caring for a 65-year-old patient with diabetes mellitus who developed oral candidiasis (thrush) with white patches and difficulty swallowing after a course of broad-spectrum antibiotics. Which nursing intervention should be implemented to prevent the spread of infection and promote healing?

Normal saline mouth rinses maintain oral hygiene and remove debris without irritating inflamed tissues, creating an unfavorable environment for fungal growth. Alcohol-based mouthwash or vigorous brushing can worsen irritation, and acidic foods may exacerbate discomfort.

Understanding the Pathophysiology
This patient developed oral candidiasis due to a disruption in the normal oral flora. Broad-spectrum antibiotics eliminate protective bacteria, allowing opportunistic pathogens like Candida albicans to proliferate. The patient’s underlying diabetes mellitus further increases susceptibility because hyperglycemia impairs immune function and provides a glucose-rich environment that promotes fungal growth. The resulting symptoms—white patches and dysphagia—indicate mucosal inflammation and overgrowth, which can lead to pain and intermittent bleeding ^[2].

Analysis of Interventions
The correct intervention is to teach the patient to rinse with normal saline after meals and at bedtime. This approach mechanically debrides the oral cavity, removing food debris that could serve as a substrate for fungal growth, without causing chemical irritation. In contrast, alcohol-based mouthwashes can dry and irritate the already inflamed mucosa, potentially worsening pain and delaying healing. Vigorous brushing with a hard-bristled toothbrush can cause microtrauma and intermittent mucosal bleeding, creating portals for secondary infection ^[2]. Acidic foods and beverages will not effectively alter the oral pH to a degree that inhibits Candida; instead, they are likely to cause significant pain on contact with eroded or inflamed tissue.

Clinical Reasoning and Safety
For a geriatric patient with polypharmacy risks, non-pharmacologic comfort measures are a first-line nursing consideration to prevent further complications. Normal saline rinses are isotonic, non-cytotoxic, and safe for frequent use. This intervention aligns with an interprofessional management framework that prioritizes maintaining mucosal integrity and preventing secondary infection, especially in patients whose oral health is compromised by both systemic disease and medication side effects . The nurse must also recognize that while topical or systemic antifungals are the definitive treatment, effective oral care is an essential independent nursing action that supports pharmacotherapy by keeping the mucosa clean and reducing the fungal load.