Hot answers tagged parts-of-the-body
The ארחות שבת (by Rav Yosef Gelber and Rav Mordechai Rubin) in Vol. 2 on page 294 in Siman 20:154 discusses this. They write that one may wear a retainer - פלטה ליישור שינים - on Shabbat. In the footnotes they explain that since the "medical" action [of moving the teeth] is not apparent, but takes a long time, therefore it's permissible. Same logic should ...
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