The effects of regular dental scaling on the complications and mortality after stroke: a retrospective cohort study based on a real-world database

BACKGROUND: Previous observational studies have shown that people with dental scaling (DS) had decreased risk of stroke. However, limited information is available on the association between DS and poststroke outcomes. The present study aimed to evaluate the effects of regular DS on the complications and mortality after stroke. METHODS: We conducted a retrospective cohort study of 49,547 hospitalized stroke patients who received regular DS using 2010–2017 claims data of Taiwan’s National Health Insurance. Using a propensity-score matching procedure, we selected 49,547 women without DS for comparison. Multiple logistic regressions were used to calculate the odds ratios (ORs) and 95% confidence intervals (CIs) of poststroke complications and in-hospital mortality associated with regular DS. RESULTS: Stroke patients with regular DS had significantly lower risks of poststroke pneumonia (OR 0.58, 95% CI 0.54–0.63), septicemia (OR 0.58, 95% CI 0.54–0.63), urinary tract infection (OR 0.68, 95% CI 0.66–0.71), intensive care (OR 0.81, 95% CI 0.78–0.84), and in-hospital mortality (OR 0.66, 95% CI 0.62–0.71) compared with non-DS stroke patients. Stroke patients with regular DS also had shorter hospital stays (p < 0.0001) and less medical expenditures (p < 0.0001) during stroke admission than the control group. Lower rates of poststroke adverse events in patients with regular DS were noted in both sexes, all age groups, and people with various types of stroke. CONCLUSION: Stroke patients with regular DS showed fewer complications and lower mortality compared with patients had no DS. These findings suggest the urgent need to promote regular DS for this susceptible population of stroke patients. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12903-023-03178-6.