Mouth guards are custom silicone coverings worn to prevent injury to the teeth. Occlusal and night guards prevent clenching or grinding of teeth while sleeping which can wear down your teeth. Some studies say that mouth guards can reduce wear by up to 80 times. Those with a crown, bridge, implant, or dentures can sometimes develop grinding and should ask about a mouth guard. Sports guards prevent damage caused during high impact sports such as boxing, football, martial arts, hockey, soccer, basketball, baseball or softball, etc. You can see professional athletes wearing them on TV. A mouth guard normally takes 2 visits to complete.