*3.2.4 Fiber-optic transillumination (FOTI)*

With the fiber-optic transillumination device, light scattering is prevented, and the tooth can be examined in detail due to the use of strong white light. DIFOTI (digital fiber-optic transillumination; Electro-Optical Sciences, Irvington, New York) method is a method in which FOTI and digital camera are combined to reduce the shortcomings of FOTI. DIFOTI includes two handpieces. One of them is used for caries detection on occlusal surfaces and the other on flat surfaces. Although it cannot be used to determine the depth of lesions, it gives as good results as radiographs in detecting approximal caries [21].
