וְגַם־אֲנִי֩ נָתַ֨תִּי לָכֶ֜ם נִקְי֤וֹן שִׁנַּ֙יִם֙ בְּכָל־עָ֣רֵיכֶ֔ם וְחֹ֣סֶר לֶ֔חֶם בְּכֹ֖ל מְקוֹמֹֽתֵיכֶ֑ם וְלֹֽא־שַׁבְתֶּ֥ם עָדַ֖י נְאֻם־יְהוָֽה׃
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Rashi
Cleanness of teeth Heb. נִקְיוֹן שִׁנַּיִם. Setting your teeth on edge. [I.e, they would have nothing to eat, and their teeth would be set on edge.] Another explanation: cleanness of teeth. This denotes the lack of meat, which goes between the teeth, as it is stated: (Num. 11:33) “The meat was still between their teeth.”