The lighted tooth stain eraser is like a tooth fairy godmother who can make things disappear simply with a wave of the wand except there's nothing unreal about its abilities. Recommended frequency of use is once every 3 weeks. The tooth stain eraser will last approximately 2 years if used once every 3 weeks. , , Brush your teeth and rinse thoroughly to remove plaque or food deposits before using the lighted tooth stain eraser. Wipe the tooth stain eraser with a moist cloth after use. Use an alcohol wipe to sterilize if necessary. This product is not meant to replace daily brushing or visits to your dentist. It is recommended that you brush your teeth twice daily and visit your dentist twice a year.