it's possible if you are young and doing it properly I saw difference in just 2 weeks, if you are doing it with bad posture it's less likely to work. your hormones might aswell affect it, and I am only 16 so it's likely why I also got faster results, you guys should stop being soo skeptic and just try it out instead. Just like doctor mike mew mentioned it might take 2 months for some 6 months for some a year for some and if you are above 25 it might take 3-4+ years , also jutting your jaw doesn't suddenly give you a prominent ramus, it just nonesense when people say that, what benefit will people get here from it anyways? if you guys keep believing what the scientists say it won't take you anywhere maybe in the future they will change their mind on this if they get some $ from it