For the source text click/tap here: Nedarim 66
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A new Mishna teaches about dissolving a vow to enhance the honour of the person making the vow or his family. The example of someone vowing that an "ugly woman" is konam for him when in fact she is beautiful - or that she is black when she is white, or short when she is tall, is repeated from an earlier daf. Another example - this one of a woman who is 'beautified’.
The man who named her as konam to him is confronted by Rabbi Yishmael who helps him realize that this beautified woman should in fact be permitted to him - and his vow is dissolved.
Another example is shared regarding the perception of beauty: a woman had a false tooth (we learn that it was likely made of wood and thus rotten and 'ugly') replaced by a gold tooth made by Rabbi Yishmael, thus dissolving the vow, and allowing her to marry.
We explore the notion of beauty in Rabbinics and feminist critiques thereof