Describe Capacity: 4ml features The pen features our innovative brush-on system that releases just the right amount of whitening gel for easy and precise application. When the gel hits your teeth, it triggers a burst of active oxygen bubbles that work instantly to remove tough stains. Experience t of a professional whitening treatment, now conveniently packaged in a handheld gel pen. Witness visible transformation in as little as one week, paving the way for a brighter, fairer smile. Teeth whitening gel pens not only ensure a bright smile, they also instill new confidence. Designed for fast-paced lifestyles, our portable pen means you'll never have to skip a whitening session. Instructions for use: Start by brushing and flossing thoroughly. Twist the pen to release the right amount of whitening gel. Purse your lips and smile to show your teeth. Gently brush a thin layer of the gel on the teeth. Wait 30 seconds, then relax lips. Do not eat or drink for the next 30 minutes. Comment: 1. Manual measurement tolerance is 2-5g. Please don't mind your substitutions. 2. Due to the difference between different monitors, the image may not reflect the actual color of the item. Thank you so much! 3. The SKU color is the color of the product packaging Package Included: 1 * Teeth Whitening Pen