笑起来嘴巴里有虎牙笑起来眼睛里有星星
[xiào qĭ lái zuĭ bā lĭ yŏu hŭ yá xiào qĭ lái yăn jīng lĭ yŏu xīng xīng]
Meaning 'When smiling, tiger-like teeth and twinkling eyes are revealed', it poetically depicts a charming smile, where sharp dimples akin to 'tiger teeth' and lively, starlike eyes express happiness, making the entire face sparkle beautifully and attractively.