What is 'black nail theory' and how can this beauty trend boost self-confidence?

Black nails are said to boost self-confidence and make you feel stronger, according to a new theory gaining ground on TikTok. Photo: AFP

Are TikTok users obsessed with colour?

After shining the spotlight on colour analysis, which helps to determine which shades are best suited to which skin tone, among other things, then elevating orange and red to the top of makeup trends with pumpkin spice makeup and red wine makeup, they're turning their attention to nails.