A low-profile expansion appliance that does not require patient compliance. The Jet Family is a collection of orthodontic appliances constructed around a highly-efficient piston and tube principle. The Spring Jet is activated in-office by unlocking the sliding mechanism and compressing the coil spring, which then provides light, constant forces until the next appointment. This bonded version avoids the use of bands, including instead a custom-fit acrylic pad to bond directly to the teeth. Available on the upper or lower arch.