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In page Contour threads:

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In the event that a patient is unhappy with the results, the threads can be readily removed and the patient's face thence returns to its position prior to treatment.[2] Thus, Contour threads have negligible permanent "biological cost", as the effect is reversible. Effects last for a number of years, quoted as 2–5 years, after which time the positive effect is gradually lost and the patient's face returns to its state prior to treatment.[citation needed]