Hang in my mouth smile, is my self-confidence, I brave!

挂在我嘴角的笑容，是我的自信，我的勇敢！

youdao

Her mouth curved in an off-centre smile.

她撇着嘴笑。

《柯林斯英汉双解大词典》

A shadow of a smile touched his mouth.

他嘴角透出一丝笑意。

《牛津词典》

They smile and they kiss. In the English language, there are many expressions using the word mouth.

VOA: special.2010.06.20

The mouth moves up, particularly if somebody is attacking their record or ridiculing them, and they'll smile and--but it's not a sincere smile.

嘴唇移动，特别当有人攻击他们的记录,或嘲笑他们时，他们会微笑，但不是真诚的微笑。

耶鲁公开课 - 心理学导论课程节选

His mouth twisted in a wry smile as he responded, one of a few moments of visible emotion during a hearing in which he appeared subdued.

CNN: BP's Hayward: Oil spill wasn't because of cost-cutting

But when you hold a pencil further back in your mouth, you are forced to smile.

FORBES: When You're Smiling

But even near the end, when she'd lost command of language, she'd mouth the words to "Dayenu" with a smile on her face.

WSJ: Passover Challenged