Clinical Effectiveness of Episodic Use of Bioactive Silica Based Versus in Management of Dentin Hypersensitivity (A 6m Randomized Clinical Trial)

Inclusion Criteria: Patients with DH, VAS ≥ 3 and Schiff sensitivity score needed to be ≥2, indicating that application of a jet of air makes the patient respond and move or requests discontinuation of the stimuli application. • Teeth with DH related to Non- carious Cervical lesions (abrasion, abfracture, erosion). • Teeth with gingival recession and exposed root dentin. \- Exclusion Criteria: * Patients with known allergies or adverse reactions to any ingredient of the tested materials. Systematic disease and/ or physical disabilities that may affect participation. • Patients who did any periodontal surgeries within the previous 3 months. • Patients with orthodontic appliances, or restorative work that might interfere with evaluation. • Patient who frequently use analgesics or any drugs that could affect the pain level. • Home or in-office bleaching and/ or in office fluoride application for 6 months before beginning of treatment. • Pregnant females with frequent vomiting attacks. • Smokers. • Systemic conditions that cause or predispose patients to develop dentin hypersensitivity (for example, gastroesophageal reflux disease, GERD). • Excessive dietary or environmental exposure to acids.