Saw in Piskei Teshuvos not to use deodorant on Yom Kippur. Are there leniencies? (I teach Halacha in High schools)
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Although some authorities are mentioned as being stringent on this matter, others are lenient (see Mikraei Kodesh 6 note 60), and where a person knows that he will suffer from bad odor, one can be lenient with spray deodorant.
Stick deodorant should not be used, because of the concern of sichah. Spray deodorant is distant from the concept of sichah (embalming with oils for pleasure), and is therefore certainly permitted for the purpose of dealing with bad odors.
[Although it is permitted to clean an area of the body that is soiled with water, and the same should apply even for stick deodorant for removing bad odors, the level of odor is hard to determine, and a person might come to apply deodorant without need. This is the reason why stick deodorant, which is closer to sichah, must be treated with added stringency.]
if a person does not suffer from bad odor, yet wishes to ‘smell good,’ deodorant should not be used on Yom Kippur.