GEN1598 R. Yochanan said: “It is better to ‘whiten’ [expose in a smile] one’s teeth to one’s friend than to give him milk to drink, as it is written:
‘ULVN shinayim mechalav’ – do not read it ‘
Uleven shinaym’ [‘and his teeth will be white’], but ‘
Ulevon shinayim’ [‘and he shall whiten his teeth’]”
Ketubot 111b TEMIMAH-GEN 191
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