Advantages * Only takes five minutes twice a day * Start to see results within a week * Unlikely to cause teeth sensitivity* FDA/MSDS/SGS approved * Comes in clear tube * Affordable CAUTION 1. Do not use this product if suffering from dental ulcers,broken gum, or after oral surgery. 2. The user with sensitive teeth shall reduce the application times or use it under the guidance of dentist. 3. Not for the persons under the age of 16 and pregnant women. 4. Discontinue use if you feel unwell. Usage After cleaning the teeth, remove the cap and rotate the end of the whitening pen until the essence overflows onto brush head. Then apply the product on the teeth evenly and rinse it with clean water after 15-20 minutes, we recommend to use 2-3 times per week