A new beauty hack called ‘mewing’ is taking over TikTok right now, with many swearing by it for perfect photos. Jump to…What is ‘mewing’ on TikTok?Mewing is when you suck in your neck to get rid of your double chin and bring out your jaw, making your face look thinner and more defined. As explained by Paul Frysh in a report on WebMD: “The basic idea behind mewing is that you can change the shape of your jawline if you think about the placement of your tongue in your mouth.” The name comes from British orthodontist John Mew, who promoted the practice in the 1970s to straighten teeth and stop pe…