I did two fractional laser treatment, and it made my pores bigger and texture worse. It revealed pores everywhere. Ive been told infini rf (microneedling radiofrequentie) or clear+brilliant laser would work best.

From medical studies, actual scarring occurs in about 2-4% of people treated. Subjective appearance differs from people to people. Although I doubt you will need one treatment unless you have very mild scarring you will most likely need multiple sessions.

I will speak about my own personal experience. I had 1 mixto co2 procedure on my cheeks, and it made things worse, no doubt. I had horrible hyperpigmentation that hung around for nearly a year, and to this day I can still see the faint demarcation from where the laser was used on my cheeks. It also left a strange texture like little holes on my cheeks. The little tiny laser holes improved over time, which I attribute to tretinoin / retin-a use and good skin care, but it's still nothing like pre-laser. I've come to the conclusion that fractional co2 lasers leave this odd texture precisely because it removes skin in tiny columns, and the skin may not heal correctly. I'm glad I never did another one because my skin clearly could not handle it.

User dependent. Less chances if provided by certified and trained doctor. If you are talking fully ablative, how do you define side effect or laser damage? If one is treating box car scars in say type 5, and you consider skin colour changes or PIH as damage, then the % goes to 100%, as it is an expected side effect. If one is treating fractional ablative at say a low density e.g.. 5% and using moderate settings, say 60 mj the chances of scarring including prolonged PIH is low. Really depends on your skin type, idiosyncratic reactions, scar depth, location, genetic propensity to keloid or hypertrophic scars, and the skill of the operator.