Bring your smile to life with a Mr Bright whitening PEN. Designed to work fast and fits easily in your pocket or makeup bag. Application takes only 30 seconds and will visibly whiten your teeth in under 30 minutes. If you follow our instructions carefully you will have no problems at all! All our products have been clinically tested and tried to ensure they are safe for you! We us 36% carbamide peroxide (the strongest over the counter formula sold) that is still safe to use on your teeth. Ingredients are carbamide peroxide, glycerin, water and potassium nitrate. Mr Bright is also enamel safe and FDA regulated to insure your safety.