For how we live.
The word covers everything from sunscreen to self-surgery. The low-risk end has real evidence behind it; the invasive end is where the harm sits, and the whole subculture carries a mental-health cost.
Hard chewing can enlarge the masseter muscle. But a bigger masseter widens the lower face — which is exactly what cosmetic clinics pay to shrink with botulinum toxin.
The technique claims that pressing the tongue to the palate will lift the cheekbones and sharpen the jawline. There is no controlled evidence it changes the adult facial skeleton.
Two large re-analyses of the same public datasets found the association is real, negative and very small. A third review found the association is not even consistent between the Global North and South.
A 422-family cohort with a pre-ban baseline is the closest thing to a controlled test the world has. Researchers are also warning the law will make studying adolescents harder — including studying this.
The trend stacks mouth tape, magnesium, trackers and a 'sleepy girl mocktail'. Sleep physicians say one unglamorous treatment carries the evidence; most of the rest is theatre.