«اِلسِّن لِلسِّن يِضْحَكْ وِالْقَلْبْ كُلُّهْ جَرَايِحْ»

The saying exposes friendliness that is only on the surface. Two people meet with broad smiles and cheerful faces, yet each privately carries hurt, grudges, or hostility toward the other. The smile is a performance, and what each truly feels runs in the opposite direction.

It works as a warning not to take visible warmth at face value. Pleasant manners between rivals, estranged relatives, or uneasy associates may cover bitterness that has never healed. The image of tooth smiling at tooth, the smiling mouths of two people face to face, set against a heart full of wounds, makes the gap between appearance and feeling vivid.

Use it to comment on two people or groups who greet each other warmly and trade smiles while quietly nursing resentment. It works as a wry aside about hollow cordiality, such as a reconciliation that looks friendly but settles nothing.