bad posture, bad tongue posture and bad sleep posture, and mix or separate bad habits in these could be a subject that leads to a overbite. the doctor loves to blame it on genetics, however its because of epigenetic. supplement vitamin d3 and k2 fix your posture everyday, it is a lifestyle sleep straight learn about mewing in sever cases, check is you have sleep apnea, if you do, consult an orthotropic, they are better than orthodontists as they keep your aesthetics and betterment in mind rather than minting money