I only meant touchups in other areas (that I’ve had professional laser done before). The Tria does cause permanent changes to hair.
The Tria caused the same shedding and inhibited growth as any other laser I’ve used, but it’s more painful and time consuming. It’s far too painful for genitals. Just bite the bullet and see a discreet professional.
For anything more than small patches or individual hairs it’s not a good substitute for professional treatments even if you’re looking to be hair free only temporarily (4 - 6 weeks).
On the other hand, if you do have small patches or individual hairs, pulsing 3 - 5 times in a row seems to have a much greater effect. This is how I’ve been able to kill darkly pigmented hairs entirely over the course of several treatments.