SMP does not penetrate the skin as deeply as a tattoo and uses special ink that won’t change colors through time. Colors are selected to match the person’s hair color and scalp color, ensuring that the hairline looks as natural as possible. SMP is completed in three sessions. Each session takes approximately two to three hours, SMP is recommended for people of all skin types and hair colors, and can also be used to cover scars, hide burns and treat other hair-loss conditions.