There are many people that deal with bad breath issues, if your doctor ruled out any health issues for your bad breath then it may just be a diet issue.

You do not need to be eating onions to have bad breath just foods that may not be agreeing with you. Eggs,cheese, coffee and even milk, can be a problem for many people. That could be your breakfast and bad morning breath issues.

Trying to change some of your eating habits and see if that makes any difference. If you eat foods and they upset your tummy, gasses will want to come out one way or another.

If not that then try checking with your dentist even if you are brushing and flossing it is still a good idea to check and make sure you do not have any cavities or gum issues since they are some of the reasons why you may have bad breath.

Another thing is try brushing your tongue if you are not already. You tongue can hold onto germs and bacteria that can cause you to have bad breath