A large randomized trial found that providing toothbrushes, toothpaste, and dental advice to inpatients reduced non-ventilator hospital-acquired pneumonia by about 60%.
Hospitals can be surprisingly risky places for infections that start after admission—and one of the most effective preventive steps may be as simple as brushing.
The new findings from Misryoum point to a dramatic reduction in non-ventilator-associated hospital-acquired pneumonia when patients were given toothbrushes. toothpaste. and clear instructions to brush during their stay.. For patients and clinicians alike. the message is hard to miss: oral hygiene isn’t only about comfort or appearance; it may directly influence lung health in the very environment where infection control matters most.
Hospital-acquired pneumonia remains one of the most serious healthcare-associated infections.. It is linked to longer hospital stays. higher costs. and higher mortality. and yet prevention strategies—especially for patients not on ventilators—have been inconsistent.. Many people associate pneumonia in hospitals with breathing machines that disrupt normal defenses. but Misryoum reports that pneumonia can also appear at least 48 hours after admission in patients who are not on ventilators.
Why that happens has been a persistent question.. One leading idea, which the trial explored, is that the bacteria living in the mouth can become a respiratory risk.. Patients breathe in microscopic droplets that may carry oral microbes toward the airways.. At the same time. the oral microbiome can shift during hospitalization—potentially making it more likely that harmful bacteria gain an advantage.. In that context. daily toothbrushing becomes more than routine hygiene: it is a targeted way to disrupt a pathway between mouth and lungs.
Misryoum’s centerpiece evidence comes from a large randomized controlled trial within the Hospital-Acquired Pneumonia Prevention (“HAPPEN”) study.. The trial enrolled 8,870 patients across three hospitals in Australia, testing different timing strategies for introducing oral care interventions.. Importantly. the design allowed researchers to see what changed when brushing support arrived. rather than simply assuming that everyone would naturally maintain oral hygiene after admission.
The study unfolded in phases.. For the first three months, there was no oral-care intervention for any group.. After that. one group began receiving a toothbrush and toothpaste alongside dental care advice—along with printed prompts and a QR code directing patients to educational materials connected to the HAPPEN program.. The toothbrushes were also designed for practical use by patients with reduced dexterity. a detail that matters because physical limitations can quietly block even well-intentioned care.
After six months. a second group received the same oral-care items. and after nine months. a third group was given the toothbrushes—meaning every participant eventually had access to brushing support in the final stretch.. Meanwhile. ward nurses received training related to oral care and were encouraged to remind patients to brush and floss. or assist those who struggled to do it themselves.. Misryoum data from routine behavior showed that outside the intervention periods, only about 15.9% of patients brushed once daily.. During the periods when the program was active. participation rose sharply: 61.5% of patients attended to oral care at least once per day. averaging roughly 1.5 times per day.
That behavioral shift aligned with a clear clinical change.. Misryoum reports that the incidence of non-ventilator-associated hospital-acquired pneumonia dropped markedly.. In the control group. pneumonia occurred at a rate of 1 case per 100 admission days. while the intervention group saw an incidence of 0.41.. In practical terms. the trial’s headline result was a 60% reduction in developing this common form of hospital-acquired pneumonia—an outcome large enough to stand out in a field where rigorous. simple interventions are often hard to find.
One reason this is getting attention is that the intervention didn’t require specialized equipment or complex clinical workflows.. Misryoum frames the approach as “simple” not because it is trivial. but because it works through a tractable mechanism: reduce oral bacterial load. reinforce the habit with education. and make assistance available when patients can’t do the task alone.. For patients. that can translate into fewer setbacks during recovery; for hospitals. it could mean fewer complications and less strain on wards.
Still. Misryoum also highlights a key nuance: real-world results can vary depending on patient mix. baseline oral hygiene habits. and why individuals are hospitalized.. Someone admitted after a procedure with strict mouth-drying risks. for example. may have different needs than someone admitted for a condition where routine self-care is more feasible.. Even so. the trial’s size and randomized structure strengthen confidence that brushing support is not merely coincidental with better outcomes.
Looking ahead. Misryoum suggests the implication is straightforward and potentially transformative: oral care protocols may deserve a more prominent place in infection prevention bundles. particularly for patients not receiving ventilation.. If daily toothbrushing can reduce a major hospital-acquired infection risk. then hospitals may need to treat toothbrushes and toothpaste the way they treat other preventive essentials—planned. supplied. and supported by staff—rather than as optional personal items that patients may forget to bring.
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