Nickel titanium springs that elevate space closing and opening mechanics to performance at levels that are unobtainable with stainless steel springs. Teeth move more efficiently due to gentle, consistent force, and periodontal trauma and root resorption are eliminated or greatly reduced by eliminating the severe initial forces generated with stainless steel springs. Increased patient comfort. Extended spring range makes frequent changes unnecessary, reducing chair time. Eliminates patient cooperation requirements. Improves hygiene: since nickel titanium elasticity reduces the amount of coils and wires required, brushing and rinsing becomes more efficient. Continuous light force for sliding retraction mechanics.