Lasers cannot target red, white, gray or blond hair and most people have multiple colors of hairs. Laser technology provides for 75%-85% (give or take) permanent reduction in hair growth. We cannot say permanent removal without acknowledging the possibility of the remaining hair percentages.
The FDA defines permanent hair reduction as:
The long-term, stable reduction in the number of hairs re-growing after a treatment regime, which may include several sessions. The number of hairs re-growing must be stable over time greater than the duration of the complete growth cycle of hair follicles, which varies from four to twelve months according to body location. Permanent hair reduction does not necessarily imply the elimination of all hairs in the treatment area.