Features:High-strength whitening gel; use anytime, anywhere; fast and easy; easy to brush a bright smile.PH Neutral; safe to use; suitable for all types of exogenous turbidity such as smoke stains; tea stains, coffee, cola, red wine, colored foods, habits and other causes of yellow teeth, black teeth.Explanation:Name: Whitening PenColor: blue whiteIngredients: Anhydrous gel; Microcapsule sustained release; GlycerinSpecifications: 1/2mlFlavor: odorlessEfficacy: bright white teeth; whitening teethApplicable to: AdultInstructions:1. Use a toothbrush or dental floss to clean the teeth first.2. Rotate the back of the whitening pen to squeeze the whitening gel onto the brush of the head and apply the tooth whitening gel evenly to the upper and lower jaws. Apply a thickness of about 1mm (Normally, the whitening range is 8-10 teeth from top to bottom. Each treatment takes 20 minutes for a week.Product Storage: Whitening pens need to be stored in cold storage, not refrigerated shelf-life is 1 year, cold storage can be stored for 2 years, please do not place in a high temperature environment for a long time. Place in children can not touch the place, do not use during pregnancy or breast-feeding.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.package:1 x tooth whitening pen