Keep out of the reach of children. Not recommended for use by children under 12 years of age. Do not use if you are pregnant or nursing. If more than the amount used for whitening is accidentally swallowed, get medical help or call Poison Control Center right away. Avoid contact with eyes. If product contacts with eyes, rinse thoroughly with plenty of water. Avoid getting whitening gel on clothes and other fabrics. If irritation of the gums or mouth occurs, discontinue use. Teeth sensitivity from the use of whitening products is usually temporary and is not harmful. If irritation or sensitivity continues, consult a dentist. Walgreens Teeth Whitening Pen is not a substitute for regular dentist care. Visit your dentist regularly.