The aim of the study is to clinically evaluate the retention and caries formation of hydrophilic fissure sealants among adolescents after one year.

Inclusion Criteria:

• Patients who have existing pits and fissures that are anatomically deep and caries susceptible.
• Healthy patients with no history of previous systematic diseases that can affect their oral health and sealant application.
• Cooperative patients who will allow the clinical applications

Exclusion Criteria:

• Uncooperative behaviour limiting the use of sealants throughout the procedure.
• Patients with history of medical diseases, drug therapies or any other serious relevant problem.
• Patients with well coalesced pits and fissures
• Patients allergic to sealant material
• Patients who underwent orthodontic treatment.