GO SMILE On The Go Teeth Whitening Pen in Beauty: NA. GO SMILE On The Go Teeth Whitening Pen in Beauty: NA. The On The Go Teeth Whitening Pen provides convenient, effortless anytime, anywhere teeth whitening to fit into the busiest of lifestyles. The unique potent formula deeply penetrates to whiten teeth inside and out, and quickly prevents new stains from setting in for a cleaner, brighter smile.. Ideal to touch-up post-whitened teeth. Refreshing mint aftertaste. Vegan & cruelty-free. 0.04 fl oz. Twist dial at bottom of pen to release whitening serum and brush a thin layer onto front surfaces of teeth, focusing on darker stains and avoiding the gum line. Do not rinse - serum dissolves away. For best results, do not eat, drink or rinse for 20 minutes after application. GSMI-WU3. GS122. Based in the San Francisco Bay Area, GO SMILE has helped whiten over 32 million smiles. They were created by a dentist and their products are known for their cutting-edge innovation, ease of use, and award-winning results. GO SMILE has revolutionized at-home and on-the-go teeth whitening by making it possible for consumers to achieve professional results without the hassle and expense of going to a dental facility. Their mission is simple: A healthier, cleaner and whiter smile for everyone.