This study aims to compare the effectiveness of diode laser photobiomodulation combined with CPP-ACPF varnish versus CPP-ACPF varnish alone in reducing dentin hypersensitivity. Participants diagnosed with dentin hypersensitivity will receive either the combined treatment or varnish application alone. Pain levels will be evaluated using a standardized visual analog scale before and after treatment sessions. The results of this study may help determine whether adding diode laser therapy enhances the effectiveness of conventional varnish treatment in managing dentin hypersensitivity.