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Dr. Charles Mok (speaker) contrasts traditional carbon dioxide (CO2) lasers with fractionated Fraxel lasers, arguing that Fraxel has surpassed conventional CO2 lasers for many uses. He explains that Fraxel settings allow control over penetration depth (epidermis → deep dermis → subcutaneous tissue) and treatment density, and uses an "aerating the yard" analogy to describe how fractional columns of tissue removal stimulate tissue regrowth.










