Accuracy. Lasers can specifically target dim, coarse hairs while leaving the encompassing skin undamaged.
Speed. Each zap of the laser takes a portion of a second and can treat numerous hairs simutaniously. The laser can treat a range roughly the size of a quarter consistently. Little areas, for example, the upper lip can be dealt with in under a moment, and vast ranges, for example, the back or legs, may take up to a hour.
Consistency. 90% of patiens see permenant results in 3 to 5 sessions.
In most cases you will see permanent results with this treatment depending on hair and skin type.