Though store-bought devices may have a lower up-front cost, they require tedious preparation and may not fit as comfortably. As custom mouth guards are made using advanced materials which precisely and comfortably fit your smile, they are more effective at reducing the symptoms of bruxism than over-the-counter appliances. If your appliance is considered medically necessary, it may be partially or fully covered by your insurance. To help cover the difference in costs, many dentists can assist with insurance reimbursement or arrange flexible financing plans.