The aim of this study is to evaluate the Desensitizing efficacy of polymeric nano calcium fluoride containing varnish and its implementation into clinical practice.

Increasing the demand to find a desensitizing agent that should be biocompatible, easy to apply, painless, not changing the dental color, fast onset, and maintain a long-term effect gives a highlight to the patented formula of the polymeric nano calcium fluoride which newly introduced into the practice .

OliNano SEAL is an innovative "varnish-like" protector based on a patented silicone polymer with a true nano technology that provides an exceptional adhesion to enamel and dentin without prior etching for approximately 12 months (other available products max. 2-3 months).

It consists of four components Silicone polymer provides excellent adhesion to enamel and dentine, with transparent formula. NANO-fluoroapatite flows into enamel micro cracks & seals it, penetrating into the dentinal tubules closing them eventually. As for the NANO-calcium fluoride it behaves as a fluoride reservoir, provides gradual and long-term fluoride release. The fourth component Amine fluoride (Olaflur) provides immediate fluoride ion release and accelerates natural remineralization.

Inclusion Criteria:

• Patients with good oral hygiene.
• The age range of 18-65 years.
• Patients from both gender.
• Patients suffering from pain due to dentin hypersensitivity.
• hypersensitive areas on facial surfaces of the teeth (incisors, cuspids, bicuspids, and first molars with exposed cervical dentine).
• non carious cervical lesions: abrasion,erosion, abfraction, and recession with cervical dentin exposure

Exclusion Criteria:

• Patient with bad oral hygiene.
• Patients with constant use of analgesic, antihistaminic, anticonvulsive, sedative, tranquilizing, or anti-inflammatory medications 72 hours before treatment and pain assessment.
• patients having received any desensitizing treatment during the last 3 months.
• Patients with allergy of any materials will be used in the study . teeth with pulpitis.
• teeth with periodontal disease installed.
• teeth exhibiting mobility (grade 2 or 3).
• carious lesions, fractured teeth, defective restorations or prosthesis.
• Patients with orthodontics appliance.