Fraxel restore is a non-ablative fractionated Erbium laser. Skin should not peel in large "chunks", and the skin color should return to near normal after 7 to 10 days. Fraxel restore treatment alone results in very fine (think confectionary sugar) flaking for a few days.
The newly released Fraxel restore Dual laser adds a 1927 nanometer Thulium laser (Solta is the only laser company offering this patented wavelength) which targets brown pigment. When this laser is combined with the restore component of Dual, then skin peels at about day 4 to 7 after treatment. The skin color may take a few weeks to return to normal from the rosey, glowing hue on day 7.
Adverse events may occur with any laser in which improper (too high) energy levels are employed.
Discuss your cosmetic goals with your laser physician, and choose your laser physician most carefully to avoid adverse events. Good luck and be well.