All of these were counterproductive
↓
❌Good posture is important
❌Don't press
❌The mouthpiece should be in the center
***
All of these were effective
↓
◎Shoulders forward
◎Press against teeth
◎Position the mouthpiece to the upper left
All of these were counterproductive
↓
❌Good posture is important
❌Don't press
❌The mouthpiece should be in the center
***
All of these were effective
↓
◎Shoulders forward
◎Press against teeth
◎Position the mouthpiece to the upper left
症状が分かりやすい