How to use- Place grinding guard in mouth. Bite on tab with front teeth. Bite back tabs with molars. Before each use- rinse mouth with water, place device in mouth, gently close mouth. Adjust the guard to fit upper or lower jaw. Prevents Bruxism Clenching. Relaxes jaw muscles, prevents teeth grinding, clenching and alleviates problems that may cause dental injuries. Anti teeth-grinding guard ready to use no boiling or molding, slim, sleek and comfortable works for upper and lower jaw, relieves pain and corrects tmj and bruxism. Wash guard with denture cleaner once a week. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.