1. A computerized method for determining a whiteness score for a user's teeth comprising: a) at a computing device, identifying a plurality of pixels from an image that show a portion of the user's teeth; b) at the computing device, determining an average pixel value for the plurality of pixels; c) at the computing device, determining a plurality of color values for the average pixel; d) at the computing device, evaluating the plurality of color values to generate the whiteness score for the average pixel, wherein the whiteness score is a single numerical value calculated based on analysis of a red color value (R), a green color value (G), and a blue color value (B) for the average pixel, further wherein the whiteness score is based on taking a square root of a sum, the sum being the total of the square of (the R value minus a maximum R value), the square of (the G value minus a maximum G value), and the square of (the B value minus a maximum B value); and e) at the computing device, displaying the whiteness score.