Laser treatments in general ablate the surface of the skin. In other words, they shoot a high powered light at the surface of the skin and cause tiny cuts to be formed or they burn the surface of the skin.
Why would you want to do that to your face? Well, technically speaking, what your esthetician or dermatologist is trying to do is they're trying to trick your skin to produce more collagen. If you get rid of the top layers of the skin, it'll signal to the body that it needs to produce more collagen. Technically, the newer collagen is going to look more perfect than the old exposed part. The side effect to having laser treatments on the face is that they end up thinning the skin out a lot.
As we age, your skin is going to thin out enough as it is and frankly, we can't even control that. By the time you're 40 years old, you're skin cells will only renew themselves every other month. If you're having a laser treatment every 6 weeks or once a month, your skin won't even be able to produce enough collagen to heal itself properly and the end result will be thinner skin. Something that I think that we should all be avoiding.
Also, I think any type of invasive treatment like laser where you're burning your skin or harming the surface of the skin in any way, you really run the risk of getting unwanted pigment or causing some kind of further damage to your face that you weren't really imagining. I never recommend laser treatments to any of my clients and I frankly prefer that clients do something non-invasive like LED light therapy.
So if you're going to do it, do a lot of research on the type of laser that your doctor is proposing using on you and do a patch test to make sure that it actually works on your skin and that your skin can heal properly.