Probiotics aids with bad breath (taken daily, flaring or not) along with IBD (CD or UC) symptoms....it's also said that eating 3 oz of yogurt daily can also aid with bad breath, however probiotics in powder or pill form have much more good bacteria which will likely aid more with IBD symptoms and bad breath...many eat yogurt along with taking probiotics.
Bad breath is usually caused by a few things, improper oral hygiene, medications and bacterial overgrowth which IBDers tend to have and is why probiotics usually aid well for symptoms of CD or UC.
:)