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Not to be confused with the tool known as a straightedge, or the song the subculture takes its name from, Straight Edge. Straight edge (sometimes abbreviated sXe or signified XXX or X) is a subculture of hardcore punk whose adherents refrain from using alcohol, tobacco and other recreational drugs, in reaction to the excesses of punk subculture.
The direction towards the biting edge of anterior teeth or something relating to this edge, such as the terms incisal guidance or incisal edge. This is the sister term to occlusal, which related to the analogous location on posterior teeth.