Description : 1 Dry Field System keeps the mouth dry while isolating arches from tongue and cheeks. 2 Combined into each appliance is an adjustable cheek retractor, saliva ejector, tongue guard and low-volume suction connection. 3 Inlets are shielded for uninterrupted evacuation. 4 Specially designed not to cover occlusal surfaces of the teeth. 5 Great for sealants, ortho bonding, and posterior restorations. High-heat plastic and silicone construction autoclavable to 280F. Simple assembly required.