This study will be conducted to assess diagnostic predictive values of a light induced fluorescence intraoral camera versus those of the visual-tactile assessment method according to modified ICDAS-II criteria in clinical

volunteers patients will be assigned in this study. Each patient should have at least one posterior tooth with pits and fissure discoloration and maximum 4 teeth. The teeth will be evaluated by two diagnostic methods (D), where D1 represents visual-tactile assessment method (ICDAS-II) and D2 represents light induced fluorescence intraoral camera.Three operators, the researcher and the 2 supervisors, from the Conservative Dentistry Department, Faculty of Dentistry, Cairo University, will be the examiners in this study. Each examiner will record the dental findings using both the visual- tactile assessment method and the fluorescent-aided identification method. The visual-tactile assessment method includes the use of mirror, probe under good illumination condition, while the fluorescent-aided identification method will be performed by light induced fluorescence intraoral camera.

Inclusion Criteria:

• Patients aged from 15 to 50 years.
• No gender restriction.
• Patients should have an acceptable oral hygiene level.
• Patients must have at least one posterior with fissure discoloration

Exclusion Criteria:

• • Patients with a compromised medical history.

  • Severe or active periodontal disease.
  • Heavy bruxism or a traumatic occlusion.
  • Acute or chronic dental infection.
  • Pregnant or breastfeeding women.
  • Patients with posterior restorations on molars or premolars.