A device for recognizing caries, plaque, concrements and / or bacterial infestation of teeth comprising:– one or more light sources (1) for generating a radiation (9), which is disposed on a tooth to be examined or tooth surface (4; 5) can be directed,the radiation (9) comprises two wavelength ranges, a first wavelength range and a second wavelength range, and this wavelength ranges are separated from one another, i.e. is spectrally not overlap with each other, and wherein the radiation (9) to be examined, a fluorescent radiation of the tooth or the tooth surface (4; 5) which excites,– a detecting means (8), which is suitable for detecting the fluorescence radiation and of the reflected radiation (10), which the tooth to be examined (4) or from the region to be examined (5) of the surface of the tooth is reflected, and– an evaluation device, which is suitable for the intensities of the reflected wavelength ranges to be set in a ratio to one another as a characteristic value, of whether caries, plaque, concrements and / or bacterial attack on the tooth to be examined (4) or on the..
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