Lighting is one of the 3 factors in visual color assessment.How white your teeth are may depend in part on the type of lighting in your bathroom. Fluorescent light is cool in tone while incandescent is warm.
The best light for evaluating tooth color is thought to be natural daylight, because it is a more full spectrum of all wavelengths of light. However, natural light is highly variable based on weather, time of day, location, etc.
Dental offices should use color-corrected lighting systems.
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