笑脸给多了惯得都是病眼泪流多了伤的都是心
[xiào liăn jĭ duō le guàn dé dōu shì bìng yăn lèi liú duō le shāng de dōu shì xīn]
'Too many fake smiles can make one get used to insincerity; too many tears shed mean more pain to the heart'. It expresses dissatisfaction towards pretending happiness when one is truly unhappy and indicates accumulated pain deep inside from long-term insincere behavior