Timing for Shurink re-treatment

I am satisfied with the Shurink treatment. For those of you who have received it, did you get it again after the effects completely wore off?

Or did you have a re-treatment done in advance for maintenance purposes when you felt your jawline or elasticity was sagging slightly?

I would appreciate it if you could share your actual experiences regarding when you were most satisfied with the follow-up treatment, the duration of the results, and how you determined the intervals for re-treatments.