Intra Oral Appliance (IOA) Model Evaluating the Efficacy of Sensitive Toothpaste

Inclusion Criteria: * Adults ≥18 years * Good general and oral health * Normal unstimulated saliva flow (≥1.5 mL unstimulated saliva in 5 minutes) * ≥16 teeth and functional maxillary dentition to support palatal appliance * Agree to abstain from other oral care products and preventive dental procedures during study * No advanced periodontal disease, no visible untreated caries * If female, not pregnant or breastfeeding (self-reported) * No significant oral soft tissue pathology; no peri/oral piercings; no removable partial dentures * No antibiotics or immunosuppressives within 30 days of screening * No palatal torus; no medical condition that would interfere with safety * No allergy or significant adverse events to impression materials, acrylics, or common oral product Exclusion Criteria: * Unable to tolerate appliance or comply with procedures * Oral pathology that interferes with participation * Use of fluoride toothpaste during washout periods * Participation in another appliance study within the last 4 week