In cardiac patients hospitalized for 25 or more days, oral health status, as measured by the Community Periodontal Index (CPI), progressively worsens, with a 16% increase in impairment by day 21 and 70% of patients advancing to clinically significant periodontal disease (CPI ≥ 3), indicating that prolonged hospitalization is associated with accelerated periodontal deterioration not observed in patients with shorter hospital stays.

Poor oral hygiene during long hospital stays allows bacteria to build up in the mouth, causing gum tissue to break down and leak bacteria and inflammatory chemicals into the blood. At the same time, hospital treatments like antibiotics and poor diet disrupt the gut bacteria, weakening the intestinal barrier and letting more inflammatory substances enter the bloodstream. These two sources of inflammation combine, overwhelming the body’s ability to control inflammation, which slows heart healing and keeps patients in the hospital longer.