SATISFACTION GUARANTEE: The satisfaction of our customers always comes first above everything else. If for any reason, you’re not satisfied with our whitening pen, we’re happy to offer you a 30-day Money Back Satisfaction Guarantee with no questions asked. This way, you can try it full of confidence without worrying about wasting your money. EASY TO CARRY & APPLY: We know you are busy. So, we made it small enough to fit in your purse. Though the best result can be achieved after cleaning & drying teeth, simply brushing the gel onto your teeth and leaving it on for 30 minutes also provide a decent whitening effect. 4 PENS & 1 MONTH SUPPLY: Our valued pack has 4 pens inside, enough supply for 1 month, 70+ uses, the most cost-effective combo that can’t be found anywhere else!. SAFE FOR DAILY USE: Our whitening formula is powered by carbamide peroxide and is safe for your teeth. People may swallow a small amount of gel applied on teeth together with saliva, which is safe. Avoid drinking it from the pen. Rinse it off 30 minutes after using it if you don’t like the taste. It has little flavor, by the way. VISIBLY WHITER TEETH IN 1 WEEK: Soniultra advanced whitening technology is fast and effective. Use twice a day for visibly whiter teeth in just 1 week! We recommend using it regularly 30 minutes before sleeping and 30 minutes before leaving home in the morning.