Best Fractional Laser Treatment for Stretch Marks?

Which fractional lasers are best at treating older white stretch marks? CO2 or erbium? Any luck with the Fraxel re:pair? A tummy tuck is not an option, since I have them on arms/legs/chest as well. I'm 23yo & got the stretch marks from gaining 40-50 lbs when I was in middle school.

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