Over time, repeatedly pulling out hairs from the same follicle can cause traction alopecia, where the trauma of plucking can damage and scar the follicle to the point that it no longer produces hair. This is the basic reasoning behind plucking eyebrows but it also applies to the hairs on your head, so pulling them out on a regular basis can make them go away for good. However, Kobren says that occasionally pulling out a grey before date night shouldn't cause any significant problems.
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