Shirai, M., et al. (2018). Effects of gum chewing exercise on maximum bite force according to facial morphology. Slightly Toxic: it contains 2 synthetic antioxidants call E321 and Butyl hydroxytoluene. These are included as preservatives to keep the gum fresh. But these antioxidants are always believed to be highly toxic for the liver, kidney's and retina. Builds the Right Muscle: you're trying to improve your jawline and your appearance... the goal isn't to just build muscle in your face, right? You have to build muscle in the right place. The masseter muscle, particularly the lower portion, is the part you want to grow. Other jaw exercisers grow the wrong muscles, which will make your face rounder. More on that later. M astic gum has been chewed for 3000 years by Mediterraneans. But now it's becoming really popular as a jawline exerciser. You can work out your jaw, and this will definitely work out your jaw,” said Dr. Parish Sedghizadeh, associate professor of clinical dentistry at the University of Southern California (USC) school of dentistry.

The problem with the product, according to Henderson and Sedghizadeh, is that the risks of using it far outweigh the benefits.

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It's Effective: Greco gum is mastic gum just like Steel. It has many of the same benefits and it's very effective. Chisell is one of the most well-respected training tools. They have done a great job in creating an excellent chewing solution without compromise. Another version of the rubber capsule jaw exerciser. These have been around for a while, and have withstood the test of time because they offer a great way to help you get your jawline in shape. Zero Joint Damage: chewing a small hard piece of gum is a natural movement and texture for your jaw, teeth and gums. You won't stress any muscles, joints or get TMJ. I can't say the same for some of the other jawline exercisers.

FDA Approved: these are made from food-grade silicon, and have been tested and approved by the Food & Drug Administration as well as by the PICA institute of BerlinActively training these muscles is also unlikely to lead to a reduction of fat on the face. It is not possible to target exactly where a person will lose fat. Instead, regular exercise and a healthful diet can help facilitate weight loss. Elsewhere on the internet, there are those who believe that "mewing" exercises can help define your jaw muscles, although these claims remain spurious. "I think mewing is a good example of the power of a story," says Timothy Caulfield, Canada Research Chair in Health Law and Policy. "This is one of those areas where there really isn't a lot of evidence, good clinical evidence, to support it. It's based almost entirely on that intuitive appeal and anecdotes and testimonials." Mouth exercisers are easy to incorporate into your daily routine. Facial fitness also complements regular physical workouts too, because face workouts can easily be done simultaneously with other forms of physical exercise. Can Be Gritty: the main downside of Greco Gum is the quality of the mastic crystals. They contain small impurities, like grains of sand, which could damage your teeth. Similar to Project Jawline, Falim Gum is yet another gum that is available on the market, making it decent for beginner chewers.