Traditional Chinese healing method gua sha has been around for a lot longer than TikTok, used to treat muscle pain and tension, mainly in the body. But today, influencers are touting it as a slimming beauty facial that can "get rid of double chins", reduce wrinkles, and create an overall more "chiselled" appearance. Gua sha (pronounced gwa-shah) involves applying oil to the skin and scraping with a smooth-edged massage tool made of jade, or other materials, to increase circulation. Gua sha tools have become really accessible, stocked at department stores for affordable prices. Claims the ancient method can permanently alter…