A Cosmetic Study to Measure the Change in Tooth Colour After Using Instant Whitening Prototypes Compared to a Negative Control

Inclusion Criteria: * Two upper central incisors must be natural. * The two upper central incisors must be within the colours of 2M2, 3R1.5, 2R2.5, 3L1.5, 2L2.5, 4M1, 2M3, 3M2, 4R1.5, 4L1.5, 3L2.5, 3R2.5, 5M1, 4M2, 3M3 from VITA 3D-MASTER Shade Guide. * The two upper central incisors must be free of intrinsic stain e.g. caused by tetracycline, fluorosis etc. * The two upper central incisors must be extrinsic stain free. * Willing to sign an informed consent form and complete a medical history questionnaire. Exclusion Criteria: * Two upper central incisors have any caps, crowns, veneers or cracks in the teeth, have excessive gum recession, or have restorations on the distal, mesial, buccal, incisor edge in the opinion of the dentist and technician. * Smoker (including e-cigarettes) or chews tobacco. * Are diabetic * Currently pregnant or breast feeding. * Currently having orthodontics bands, partial removable dentures. * Currently experiencing severe oral problems such as untreated caries, gingivitis or periodontal disease. * Regular use of medication, which in the opinion of the study dentist, could interfere with study objectives. * Known allergies to the toothpaste ingredients or to any dental materials. * Use of tooth bleaching products in the past 6 months. * Have been using whitening oral care products in the last 12 weeks or had a scale and polish in the last 3 months. * Have or have had a medical condition that in the opinion of the study dentist would make them uns…