May deodorant be applied on Yom Kippur, or is it a case of anointing which is forbidden?
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The Shulchan Aruch (OC 614:1) rules:
This site cites Rav Elyashiv as recommending against spray deodorant because it is a "cosmetic", implying that on a more basic level it should be permitted. They take it for granted that stick deodorant is problematic.