Yes Gut issues are manifested in your breath!
LOL
I am very very aware of this especially when I am having an active flare. I am very concious of my oral hygiene and sense having crohns I have stepped it up 10 fold! I do have great teeth and I take care of my mouth and always stay aware of my breath...It does not smell because of my vigilence! I floss daily! that is the number one thing...I have mouth wash, floss, tooth paste and a tooth brush at work! I have floss and a tooth brush and tooth paste at school!
I drink lots of water and hot tea...I was diagnosed at 14 and my mom would always say she new I was not feeling well because she could tell in my breath...she would say hows your stomach because your breath has a certain smell to it the last week...(A Mothers love eh!! LOL)
Anyhow drink lots of water I cant express that enough and be vigilent about flossing and brushing and mouth washing...I also noticed that because I do this I dont have a problem with oral manifistations of Crohns in the form of mouth soars etc...