How do i get rid of really bad breath besides dental visit?

Depends: Bad breathe can have many causes : gum disease , reflux , stress , diet. Something as simple as brushing your tongue can help.

Clean your mouth: You should clean your mouth thoroughly by brushing and especially flossing. You should use a tongue scraper to clean your tongue. It is important to moisturize your mouth as dry mouth will increase bad breath. Avoid foods such as onions, coffee, cheese or brush after you intake these foods, finally if you are on a low carb diet ketones are produced which cause bad breath so eat a carb rich snack.