Laser skin resurfacing techniques (LSR) are used to remove aged or sun-damaged skin. By removing the dry and dull skin the younger skin or rather, the younger looking skin emerges.
Regarding its effectiveness, this is what the world renowned Mayo Clinic has to say:
Laser resurfacing is an effective treatment for minor facial flaws. For example, it can lessen the appearance of fine lines around your eyes, mouth and cheeks. It can also improve your complexion if you have yellowish or grayish skin tones.
So go in for laser skin resurfacing (LSR) with realistic expectations. Weigh its benefits and risks and as usual consult a dermatologist before submitting to it.
Related read: My Experience with Laser Skin Resurfacing