Features:<br />Compatible with sterilization and the autoclave (&lt;130?C)<br />Can be as Cheek Retractor/mouth opener/ Lip Retractors/ Cheek Expanders<br />Health and safety materials， elasticity， consistent with mouth， very practical.<br />Smooth surface is more comfortable.<br /><br />Specification:<br />Shape: O-shape<br />Material:Polyvinyl chloride<br />Color:White<br />Dimension: approx. 7 x 6.8 cm / 2.76 x 2.68 inch<br /><br />Instructions:<br />Stretched in the vertical direction of the patient's mouth for the treatment of front teeth area， orthodontic treatment to adjust the effect is very good.<br /><br />Package Includes:<br />4 x Cheek Retractors Mouth Lip Opener<br />