This Smileactives Advanced Teeth Whitening Pen collection provides fast, effective, super-convenient teeth whitening. Each pen lasts for up to three weeks, and is enough for a full course of twice-daily applications. Some participants in the clinical trial saw results in as little as two days. Full results will take longer depending on the type of teeth staining you have. In a clinical trial, after just three weeks of use, the pen whitened teeth an average of five shades, with some participants seeing up to 10 shades of whitening. With this unique formula, the gel dries onto your teeth, so no need for strips or trays. And, each pen contains enough product for up to three weeks of twice-daily applications, so it could not be more convenient. No other equipment or product material is required. In a consumer use survey, the majority of users reported that they prefer using a pen over other methods of whitening. In addition, most users did not report sensitivity. How do I use it: After taking off the cap, twist the opposite end until a small drop of gel is visible on the brush tip. For a brand-new pen, several twists may be required to break the seal and prime the brush. Apply a thin layer of the gel directly onto the front surfaces of the upper and lower teeth, and allow it to dry for a few seconds. Replace the cap. It is recommended to abstain from eating or drinking for 20 minutes after application. From Smileactives. Includes: