In the present work the novel compact system for visualization of the spatial intensity distribution of the photosensitizer fluorescence for the antibacterial photodynamic therapy in dentistry is suggested. The compact intraoral system includes visible imaging camera and violet laser diode. The wavelength of the laser radiation is matched to the short-wavelength absorption peak of the photoditazin, so the effective excitation of its fluorescence is ensured. The built-in spectral-selective optical filter allows the camera to detect only the spatial distribution of the fluorescence intensity while the excitation radiation is blocked. Intraoral fluorescent images obtained with the suggested system can be used for diagnosis of residual amount of pathogens.