No slip grip. NOTE: It is easier to peel the teeth whitening strip off the back of your teeth first. After that rinse your mouth to remove residual gel.Note:Please use it twice every day, whitening treatment 1-2 weeks, No less than 5 treatments per week. If less than 5 times, the whitening strips won't whiten your teeth.Warning:1. This product is not recommended for pregnant women or children under 12 years old.2. Do not use the strips in case of mouth ulcer, gum injury or after oral operation.3. Avoid contacting with eyes, it contact occurs rinse with water immediately. 4. Do not swallow strips.