Colgate Optic White Overnight Teeth Whitening Pen Enamel Safe Sensitive Stain RemoverAdvanced Overnight Whitening Formula Works effectively while you sleep to remove years of stains caused by food and drink for a brighter smile Gentle Enamel Safe Technology Specifically designed to be tough on stains but kind to your teeth ensuring no damage to the protective outer layer Formulated For Sensitive Teeth Features a specialized gel that minimizes discomfort and irritation making it ideal for those with tooth sensitivity Precision Brush