natural teeth whitening pen with 4x3ml tooth whitening gel removes stains safely,30+ uses effective, painless, no sensitivity,travel-friendly, easy to use,best effective tooth whitener pankoo pankoo nature teeth whitening pen uses a gel containing active oxygen bubbles which safely and instantly begins to remove apparents stains, with gel dries quickly to use easily. package inculding >>> teeth whitening pen 3ml x4 directions >>> 1. shake whitening pen well for 5 seconds. 2. apply petroleum jelly to inside of lips and gums prior to starting treatment (optional). 3. twist clockwise several times (initially requires multiple turns) until the teeth whitening gel covers the brush tip. 4. gently apply a thin layer of teeth whitening gel onto teeth, avoiding gums or lips. 5. be sure to cover all surfaces of tooth and its crevices. 6. keep smile for 30 seconds for whitening gel to dry on teeth . 7. rinse your mouth after half an hour. 8. do not eat or drink within 1 hour. 9. repeat as needed. do not exceed 2 applications per day. tips >>> 1. for external oral use only, do not swallow. do not exceed 2 applications per day. 2. rest for a few days before next using,if you feel sore after use. 3. children under 18 years old, elderly, pregnant women, breastfeeding women with caution. 4. please don't use if you are sensitive to this product. 5. please store our product in a place which is out of children's reach. 6. use the product only as directed and for its intended use (only intended for natural teeth). 7. excessive use may temporarily cause teeth sensitivity. do not use if allergic to any ingredients, if irritation or swelling occurs,or have sensitive teeth.consult a dental professional or physician if any of these symptoms occur. 8. you may brush using toothpaste before or after using pankoo tooth whitener, however, it is recommended that you brush before using the teeth whitening gel pen.