DenTek Ultimate Guard fits the front and back teeth and comes with a SmartFit Tray to help provide a dentist-quality fit like a full coverage guard. Quickly customize the DenTek Ultimate Dental Guard in 3 easy steps. Complete fitting instructions are inside the package. Read all instructions and watch the full video before fitting the DenTek Ultimate Dental Guard. All parts are BPA free. DenTek Ultimate Dental Guard will give you 6 months of guaranteed protection from the date of purchase (1). DenTek is the Number One OTC dental guard brand for nighttime teeth grinding (2). Teeth grinding, also known as bruxism, is when a person clenches their jaw and the upper and lower teeth scrape and grind against each other. DenTek Ultimate Dental Guard helps to prevent conditions caused by teeth grinding including jaw discomfort, tooth chipping and cracking, and headaches. DenTek is also ranked best mouth guard for daytime grinding (3). Go beyond brushing with DenTek! Help preserve and protect your natural teeth for a lifetime with DenTek's innovative dental care products. FSA- and HSA-eligible product in the U.S.