Why do monks and nuns have to shave their heads?(GDD-382) DVD

In ancient India it was a custom for practitioners to shave their heads to show they'd renounced the five desires, for our hair adorns our body and so it can be said to stand for sensual desire. Hair also symbolizes our mental affliction as well as our attachment to worldly affairs and emotions and so shaving our heads symbolizes that we want to eradicate our afflictions and suffering.
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