Bad breath can have several causes:
1. Good oral hygiene is usually enough to prevent and treat bad breath. When you brush your teeth, try to brush the back of your tongue, where it is harder to reach.
2. Your dentist can advise you on how to improve your oral health and can refer you for further investigation if they think there may be another cause for your bad breath.
1. Get a very good friend to be absolutely honest, but do make sure they are a true friend.
2. A simple test you can do yourself is to lick the inside of your wrist and wait for the saliva to dry. If the area you licked smells unpleasant, it is likely that your breath does too.