Gua sha is a traditional Chinese healing method in which a smooth-edged tool - the gua sha stone - glides across your face to improve circulation and break up stagnation-induced retention. They can be used all over the body, but are the most beneficial on the face – and by now, you've probably seen all of your favourite influencers and TikTok'ers using them. As such, you’ve probably been wondering whether it’s worth adding a gua sha stone to your skincare routine or not. We've let the experts weigh-in, and we're here to tell you everything you need to know.