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No one has a perfectly even hairline. Some hairlines are more straight than others, but everyone has at least one place where their hairline dips down or recedes slightly. Most of the time it doesn't matter -- your bangs camouflage it. If you wear a buzz cut like Amber Rose, though, an uneven hairline could detract from your cut. You want people to admire your cut, not stare at your forehead trying to figure out what is not quite right. To straighten things out, you need to edge your front hairline -- guys do it, so can you!
Check out your hairline, focusing on your trouble spots. Envision an imaginary straight line at the top of your hairline -- where your bangs would be if you had any. If you need help, place a comb horizontally on your forehead with the teeth pressed into the center of your forehead right where your hairline meets the skin. Rock the comb back and forth to see the straight line.
Hold the comb in place with your non-dominant hand -- keep it parallel with the floor, you don't want a sloping hairline. Pick up the trimmers or edgers and place the cutting teeth along the imaginary line. Pull down slightly to remove the hair below the line. Start in the center and work your way out to each side.
Avoid cutting into the sides of your hair. Go just as far as your hairline goes and stop. To make a seamless transition from your bang area to the sides of your hair turn the trimmers on their side and edge your temples with a vertical line.
Follow the same steps to fix a crooked nape line -- the hairline at the back of your head just above your neck -- as you did for your bangs or that place where your bangs would be.
Do not go too far into your hair. Stay close to your natural hairline. You only want to remove the hair that grows slightly below the imaginary line, not an inch of your scalp hair.
Trimmers and edgers can pull your hair instead of cutting it if they're not cleaned and oiled properly. Brush all loose hair from the trimmers and place a small amount of clipper oil right on the cutting blade after each use.