Stannous Fluoride and Gingivitis

Inclusion Criteria: * Be 18 years of age or older; * Provide written informed consent and receive a signed copy of consent; * Agree to delay any elective dentistry, including dental prophylaxis, and to report any non-study dentistry received during the course of this study; * Agree not to participate in any other oral care studies for the duration of this study; * Agree to refrain from any form of non-specified oral hygiene during the treatment periods, including but not limited to the use of products such as floss or whitening products; * Agree to return for all scheduled visits and follow study procedures; * Have at least 16 natural teeth; * Be in good general health, as determined by the Investigator/designee based on a review of the health history/update for participation in the study. For Unhealthy Group: * Have at least 20 bleeding sites (sites with a score of 1 or 2 on the Screening GBI exam); and * Have a minimum of 3 sampling sites with bleeding and pocket depth \>/=3mm but not deeper than 4mm at the Screening visit. For Healthy Group: * Have a maximum of 3 bleeding sites (sites with a score of 1 or 2 on the Screening GBI exam); and * No pockets deeper than 2mm. Exclusion Criteria: * Self-reported pregnancy or the intent to become pregnant anytime during the course of the study; * Inability to comply with study procedures; * Rampant caries, open or untreated caries, or advanced periodontitis requiring prompt treatment; * Severe periodontal disease, including but not limited to purulent exudate, generalized mobility, and/or severe recession; * Fixed orthodontic appliances or attachments for aligner treatment; * Having had a dental prophylaxis within 2 weeks of plaque sampling visits; * Having taken antibiotics or used anti-gingivitis/anti-bacterial oral care products such as chlorhexidine or Listerine within 2 weeks of plaque sampling visits; * Needing an antibiotic prophylaxis prior to dental visits; * Presenting with any disease or condition(s) that could be expected to interfere with examination procedures or the subject's safe completion of the study; or * Having any condition or disease, as determined by the Investigator/Designee which could be expected to interfere with examination procedures or with the subject's safe completion of the study.