This 6-month clinical study was designed to investigate clinical efficacy on plaque and gingivitis for the Meridol Base Mouthwash containing 0.2% zinc lactate, 0.17% amine fluoride and 0.0275% sodium fluoride as compared to a Negative Control Mouthwash containing 0.057% sodium fluoride after 3 and 6 months of product use.

Inclusion Criteria:

• Subjects, ages 18-70, inclusive.
• Availability for the six-month duration of the clinical research study.
• Good general health.
• Initial gingivitis index of at least 1.0 as determined by the use of the Loe-Silness Gingival Index.
• Initial plaque index of at least 1.5 as determined by the use of the Quigley-Hein Plaque Index.
• Signed Informed Consent Form

Exclusion Criteria:

• Presence of orthodontic bands.
• Tumor(s) of the soft or hard tissues of the oral cavity.
• Advanced periodontal disease (purulent exudate, tooth mobility, and/or extensive loss of periodontal attachment or alveolar bone).
• Five or more carious lesions requiring immediate restorative treatment.
• Antibiotic use any time during the one-month period prior to entry into the study.
• Participation in any other clinical study or test panel within the one month prior to entry into the study.
• Dental prophylaxis during the past two weeks prior to baseline examinations.
• History of allergies to oral care/personal care consumer products or their ingredients.
• On any prescription medicines that might interfere with the study outcome.
• An existing medical condition that prohibits eating or drinking for periods up to 4 hours.
• History of alcohol or drug abuse.
• Self-reported pregnant or lactating subjects