Pearlys Teeth Whitening Pen Pearlys Teeth Whitening Pen contains sodium perborate 0.16% & sodium bicarbonate to help whiten teeth. Pearlys Teeth Whitening Pen should be used once or twice a week, before bed & after you brush with your Pearlys Powder. Directions Twist the bottom of the pen until the gel is deposited at the brush tip. Smile wide, keeping your lips away from your teeth. Whilst looking in a mirror, apply a thin application of the gel onto the teeth being very careful not to put any gel onto the gums. If you do put gel on your gums wipe it off immediately with a cotton bud. Keep your smile wide for 60 seconds until the gel has dried. Rinse off after 10 minutes. Cautions Not to be used by children under 16 years. Keep away from the eyes. Not to be swallowed. Keep out of reach of children.