A Clinical Study to Evaluate the Stain Reduction Efficacy of a Non-Fluoride Tooth Whitening Dentifrice Containing Nano-Hydroxyapatite (nHAP) and a High Cleaning Silica Abrasive System Compared to a Commercial Fluoride Non-Whitening Dentifrice as a Negative Control

Inclusion Criteria: Consent Demonstrates understanding of the study and willingness to participate as evidenced by voluntary written informed consent and has received a signed and dated copy of the informed consent form. 2\) Age Aged at least 18 years. 3\) Compliance Understands and is willing, able and likely to comply with all study procedures and restrictions. 4\) General Health Good general health with no clinically significant and relevant abnormalities of medical history or dental examination in the opinion of the investigator or dental assessor. 5\) Dental Details 1. Good oral health with 16 natural teeth including 11 of the 12 anterior teeth. 2. All facial surfaces gradable with no large restorations as judged by the investigator or dental assessor. Exclusion Criteria: Pregnancy Women who are known to be pregnant or who are intending to become pregnant over the duration of the study. 2\) Breast-feeding Women who are breast-feeding. 3\) Allergy/Intolerance Known or suspected intolerance or hypersensitivity to the study materials (or closely related compounds) or any of their stated ingredients. 4\) Clinical Study/Experimental Medication 1. Participation in another clinical study or receipt of an investigational drug within 30 days of the screening visit. 2. Previous participation in this study.