<p>It doesn't stretch your lips and you will not feel uncomfortable. It is not only for dental use, cheek Retractor to help open your mouth during bleaching or other dental treatment, but also for a new game, that is to put on one of these mouth openers and try to say a challenge phrase</p> <p>Material: Plastic <br> Color: Blue <br> Shape: C shape<br> Large: 5.1x3.6x0.8inch/130x92x21mm, Medium: 4.6x3.5x0.8inch/118x90x20mm, Small: 3.8x2.8x0.8inch/96x70x20mm<br></p> <p>Packaging including: <br> 4pcs S Size cheek retractors<br> 10pcs M size Cheek retractors<br> 5pcs L Size cheek retractors<br> 20pcs blank card<br></p>