Digital Hard Nightguard Splint -Kios Style Nightguard Kios splint is a removable, custom-fitted plastic appliance that fits between the upper and lower teeth to prevent them from grinding against each other. This appliance intended to relieve temporomandibular joint pain and other effects of grinding the teeth (bruxism). Usually worn at night to prevent grinding during sleep. https://www.dentcaredental.com/OurProducts.aspx?Id=28 This 3d digital appliance actually designed in 3Shape Appliance Designer and realistically rendered in KeyShot Pro.