& orthodontic treatment (straightening teeth)
Orbicular muscle of mouth acts "keep pushing teeth with muscles at around mouth for 24 hours" as an orthodontic treatment (straightening teeth) naturally, after Lip Closure Strength / Force is increasing in by daily exercise.
Note: Basically, 12 years old and below whose bone is still soft can be straightening teeth.
Thatfs reason why Patakara® lip trainer is duly approved as general medical device by ministry of health in Japan.
*There are individual differences in effect.