Did you know that ancient Romans used urine as a teeth whitener? (Gross, but true.) Or that in 16th-century England, soot and charcoal were used to BLACKEN teeth to look like Queen Elizabeth I’s, ...

Teeth naturally darken over time due to various factors that affect enamel and dentin layers. Coffee, tea, red wine and dark-colored foods gradually stain the outer enamel surface, while smoking ...