I feel the different in my jawbone after doing it for 3 months. Not much but atleast it was a little bit better
Should be taught in schools
When i read about it i realised how my teeth straightned without braces cause i was doing this naturally just at an early age i had a blocked nose all the time so when my adult teeth came some of them were crooked.
I do not need it but give it a try if you want a sexy jawline. I've read somewhere that developing the jawline is a mixture of some hormones that make it grow forward
There's yet to be any proof it actually works. I think it's placebo.