Make sure the family member is either doing it themselves or the staff is doing it.
"NVHAP, a risk for virtually all hospital patients, is often caused by bacteria from the mouth that gathers in the scummy biofilm on unbrushed teeth and is aspirated into the lungs."
https://www.nbcnews.com/health/health-news/hospital-acquired-pneumonia-killing-patients-simple-way-stop-rcna37330
It might make the nursing home aide's job easier.
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I do not think that dental hygiene is a priority when it comes to NHs. Sometimes the residents fight it. There are ways to get around it. Little sponges on a stick for one. They already have paste in them.