Several materials and techniques have been developed to enhance the longevity of pit-and-fissure sealants, including the use of flowable composite resins as pit-and-fissure sealants . However, the clinical longevity of flowable composite as fissure sealants is directly related to their retention, where the percentage of rate of retention differ on a 12-month follow-up examination were the partial loss rate of flowable composite material ranges from 15.5% to 16.5% and total loss were ranged from 12.7% to 13%, while on a 24-month follow-up examination the partial loss rate ranged from 18.1% to 20% and total loss rate ranged from 15.6% to 17%, and that depends on morphology of pits and fissures, adequate isolation, conditioning of enamel, application techniques, particular material characteristics like viscosity, surface tension, adequate adhesion and penetration of the material into the previously etched system of fissures.