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Young men on the social media app, TikTok have been demonstrating how to get sharper cheekbones and a strong jawline by using hammers and other hard objects to physically chisel their bones in to the shape they want.

The #bonesmashing hashtag has been viewed over 260 million times on the social media app and now doctors have been making their own TikToks to explain just how dangerous this trend is.

Dr Prem Tripathi, a plastic surgeon in California explains just how harmful 'bone-smashing' is and the long-term damage it can cause.

(Photo: Dr Prem Tripathi. Credit: Dr Prem Tripathi)