[itchyouch]

Interesting side note, when I did a 4-day water fast, I noticed around day 2 that my morning breath was virtually gone.

I figured there's always enough bacteria in the mouth to cause morning breath, food consumption or not, but there is definitely an exacerbation of mouth bacteria from food consumption.

[SketchySeaBeast]

When did your ketosis breath disappear?

[itchyouch]

IIRC, within hours of breaking fast. At most a day. Unless one still stays at significant enough caloric deficit.