An oral care evaluation system may include: a light source configured to emit a spectrum of light which induces fluorescence in an organic compound, the light source illuminating soft oral tissue within an oral cavity; an image sensor receiving light generated by fluorescence of the organic compound on the soft oral tissue, the image sensor generating image data for an image of the oral tissue, the image comprising a plurality of pixels; and an image processor receiving the image data from the image sensor and programmed to evaluate oral hygiene of the soft oral tissue by assessing an attribute of each pixel in the image.