The usual place to pierce the eyebrow is at a 35 degree angle from the outside corner of the eye (see illustration on front cover), however, it may be pierced anywhere along the eyebrow from directly above the eye, to the edge of the eyebrow. The eyebrow should never be pierced further in than directly above the eye, because of the presence of the three major Supra-Orbital nerves, piercing one of these nerves can cause permanent damage.
The piercing is usually done at an angle to make the ring sit better, if the piercing is done vertically it sits directly outward and has a greater likelihood of migration (see migration). There is a variation of eyebrow piercings invented by "Angel Binnie" a famous American piercer, this piercing is done horizontally just under the eyebrow so that the ring hangs downwards."[1] More recently (in 2007 particularly) it is becoming more and more popular (in the midwest in particular) to pierce one's eyebrow horizontally as it becomes more visible when the piercing is already in place. It does take longer to heal, averaging 8 weeks.