Then he mentioned the hadith of Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) did not laugh so much that his palate would be visible.

The Shaykh : Then he mentioned the hadith of Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) did not laugh so much that his palate would be visible. This means he did not laugh excessively, opening his mouth until his palate was visible. Rather, the Prophet (peace and blessings be upon him) would smile or laugh until his molars or canines were visible, but with a smile, not with loud laughter that opens the mouth and reveals the palate. This is part of the dignity of the Prophet (peace and blessings be upon him and his family). Therefore, you will find that a man who laughs loudly, opening his mouth, is considered easygoing and insignificant in the eyes of people, lacking dignity. As for the one who smiles frequently in appropriate situations, he is beloved; hearts open at the sight of him and find peace in him. And success is from Allah.