Antimicrobial Effect of Tropolone Containing Versus Tropolone Free Mouthwash

This trial is comparing the germ-killing (antimicrobial) effectiveness of two types of mouthwash — one containing a compound called tropolone and one without it — to see which is more effective at reducing harmful bacteria in the mouth. **You may be eligible if...** - You are between 18 and 45 years old - You appear to be in good health with no significant medical history - You are willing to temporarily stop your usual oral hygiene routine for 2 to 4 days before the experiment **You may NOT be eligible if...** - You have a compromised immune system or other serious health conditions - You have taken any antibiotics or antimicrobial agents in the last two weeks - You have dental braces, dentures, or other fixed or removable dental appliances - You have a high number of dental cavities (DMF score above 6) Talk to your doctor to see if this trial is right for you.