This one-year prospective intervention study evaluated the influence of fermented lingonberry juice (FLJ) mouthwash on various salivary parameters. Twenty-five adults participated, using 10 mL of FLJ as a mouth rinse for 30 seconds daily over a six-month period, alongside their regular oral hygiene practices. Clinical oral examinations and sample collections were carried out at baseline, six months, and one year. Measurements included resting and stimulated salivary flow rates, resting saliva pH, and buffering capacity of stimulated saliva. Participants also completed questionnaires assessing perceived mouth dryness at each visit. The use of FLJ mouthwash resulted in improvements across all five salivary indicators, with statistically significant differences observed throughout the study according to omnibus testing. Questionnaire analysis further demonstrated a reduction in xerostomia symptoms following FLJ use. Overall, daily rinsing with FLJ enhanced salivary secretion, buffering ability, and pH, suggesting that FLJ mouthwash can serve as a safe, supportive addition to daily oral care by promoting oral health, protecting dental and mucosal tissues, and alleviating dry mouth discomfort.
