上門牙靠前下門牙靠後可解決一切歌唱難題
唱歌前，下牙齒和整個下巴裡收向後滾動，上牙齒和整個上口蓋向前滾動，上牙齒比下牙齒靠前一指寬，反覆練習，可有效打通口腔、咽腔和整體的上部腔體、中部腔體和下部腔體，可有效地實現高音腔體、中音腔體和低音腔體的混聲，使氣息比較容易吸得深，也使氣息比較容易達到額腔這個最高位，從而使聲音即有深度又有寬度。
上門牙靠前，下門牙靠後，牙關打開後，可使咬字、吐字更加靈活、準確，易於變化。
上門牙靠前，下門牙靠後，可有效使面罩部位的上部腔體張緊，高音更加飽滿、明亮，輕鬆實現高音帶胸腔混聲。
上門牙靠前，下門牙靠後，可有效打通口腔和咽腔，使氣流更容易到達胸腔，使氣息吸得更深，使低音更渾厚、更飽滿，輕鬆實現低音帶額腔和鼻腔混聲。
上門牙靠前，下門牙靠後，吸氣打開後牙關，自然抬起小舌頭，注意力同時放在面罩、口腔咽腔和胸腔，是打通人體整個腔體，實現渾聲的有效惟一途徑。
——陽光正義書院徐文欽
The upper front teeth rolling forward and the lower front teeth rolling backward can solve all the singing problems
Before singing, the lower teeth and the whole chin roll back, the upper teeth and the whole upper mouth cover roll forward, and the upper teeth are one finger wider than the lower teeth. Repeated practice can effectively open the oral cavity, pharyngeal cavity and the whole upper cavity, middle cavity and lower cavity, and can effectively realize the mixed sound of high pitched cavity, middle pitched cavity and low pitched cavity, so that the breath is easier to be absorbed deeply and the sound is more comfortable It makes it easier for the breath to reach the highest position of the frontal cavity, so that the sound has both depth and width.
The upper incisor is in front, the lower incisor is in back. When the jaw is opened, it can make the articulation more flexible, accurate and easy to change.
The front upper incisor and the back lower incisor can effectively tension the upper cavity of the mask, make the treble fuller and brighter, and easily realize the chest mixing of the treble band.
The front upper incisor and the back lower incisor can effectively open the oral cavity and pharynx cavity, make the air flow easier to reach the chest, make the breath deeper, make the bass thicker and fuller, and easily realize the mixing of the frontal cavity and nasal cavity.
The only effective way to get through the whole cavity of the human body and realize the muddy sound is to put the upper incisor forward and the lower incisor backward, inhale to open the back teeth, naturally lift the little tongue, and pay attention to the mask, oral cavity, pharynx cavity and chest cavity at the same time.
——Sunshine justice academy Xu Wenqin