‘Black Nail Theory’: How a nail polish color can boost self-confidence

By Julia Klintsova / Getty Images Not content with tips and inspirations to improve beauty routines, social media users are now working on boosting their self-esteem. And that can only be a good thing — right? This can currently be seen with “Black Nail Theory.” Rather than a complex psychological doctrine, it’s about how a simple nail polish color can help everyone gain in self-confidence. Not content with tips and inspirations to improve beauty routines, social media users are now working on boosting their self-esteem. And that can only be a good thing — right? This can currently be seen w…

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