SOLD BY MG MART HOW TO USE JAWLINE EXERCISER ? 1. TO FIT FIRST PRACTICE PLACING JAWLINE EXERCISER AND GET THE FEEL FOR HOW WIDE YOU SHOULD OPEN YOUR MOUTH. 2. STICK YOUR THUMBS THROUGH THE HOLE PLACE AND ADJUST JAWLINE EXERCISER SO YOU ARE BITING DOWN ON BITE STRIPS. 3. BITE DOWN AND HOLD FOR 15 SECONDS TO CUSTOMIZE THE MOUTHPIECE TO THE CONTOURS OF YOUR OWN MOUTH. 4. REMOVE JAWLINE EXERCISER FROM THE MOUTH AND COOL YOUR IMPRINTS UNDER COLD WATER FOR A FEW SECONDS TO PERMANENTLY SET IMPRINTS.