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Very little pressure is needed to either move or retain the positions of teeth. The Tru-Tain retainer is very thin, yet strong enough to maintain adequate pressure, while not encroaching on the freeway space. Minor tooth movements of teeth may be made by altering positions of teeth before making the retainer. This thin plastic is flexible, which is necessary to produce minor tooth movements. The present material and design of the Tru-Tain retainer has been used for over 30 years.