The method involves emitting light in a region of excitation wavelength for fluorescence. The excitation wavelength is chosen in such a manner to stimulate the tissue and substances in the interior of human teeth with fluorescence so that the teeth interior absorbs light in the range of excitation wavelength due to fluorescence and emits light in the range of emission wavelength. The light in the region of emission wavelength is detected for the signal evaluation. An independent claim is included for a device for optical measurement of human teeth.
