This product is not recommended for use by anyone under 14 years of age, individuals with gum disease, gingivitis, bleeding or severely receding gums, tooth sensitivity, pregnant or nursing mothers. Review ingredients to avoid any allergic reactions. Do not use while wearing dental braces. This product only works on natural teeth. It will not harm fillings, crowns and caps, but it will not whiten them. Minimise contact with lips and gums. Do not exceed recommended light exposure time. Do not stare into the Dual-Action Whitening Light during operation as it may be harmful on the eyes. Use for period longer than 14 days should only be under the advice and supervision of a dentist. Discontinue use immediately if irritation or rash develops. Keep Whitening Solution, Activator Gel and Whitening Light away from heat, sparks, and open flames.