The goal of this clinical trial is to evaluate the effect of a mouthrinse containing an active ingredient benzydamine hydrochloride in the absence of daily oral hygiene. The study includes periodontally healthy female subjects and experimental phase will last for three days. Plaque accumulation is the primary evaluated outcome, measured by a particular periodontal index called Plaque Control Record (PCR). Gingival inflammation (bleeding) is the secondary evaluated outcome, measured by a particular periodontal index called Bleeding on Probing (BoP). Researchers will compare benzyadamine hydrochloride mouthrinse to a placebo (a look-alike substance that contains no active ingredient) mouthwash to see whether benzydamine hydrochloride use results in greater plaque accumulation.