Hello. If you're meaning a strange smell being bad breath then yes, I have had this since I was young and I know how bad it can be, I am very anxious about the smell and I tend to avoid talking to people or if necessary I'd talk to them at a far distance. My only way to help you is by suggesting you chew chewing gum on a regular basis ( when you start to notice the smell ) or you could try mouth wash, today my mother bought a very expensive mouth wash ( 15 pounds/20 dollars and it's rather small bottle ) this mouth wash is apparently very good at preventing bad breath but I am unsure to wheter it helps with crohns but I will let you know if it works.