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I’m pretty sure that on a non fast day, one must wash their mouth before praying, to avoid saying the name of Hashem with a bad breath. So if your not allowed to brush your teeth on a fast day (I believe), then is it permissible to pray with a bad breath on fast days?

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    Why don't you ask to verify if what you're "pretty sure" about is true before asking if it applies on Tisha Bav? – Double AA Jul 22 '18 at 23:05
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    It's not mandatory that one wash his mouth before uttering God's name (or praying), cf. Shulchan Aruch 4:17, though it is prohibited to consume liquid on a fast-day. Hence we don't wash/rinse the mouth lest one ingest the water. In short: a good habit doesn't outweigh a prohibition. (OTOH, brushing/rinsing the mouth with the head faced down, taking precautions not to swallow, some would permit on a fast-day.) – Oliver Jul 23 '18 at 13:46

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