You may want to start flossing every day and scrap your
tongue with a
tongue scraper and see if the bad breath goes away. You could even rinse with a mouthwash; I like the Natural Dentist mouthwash but you have to get that at a healthfood store.
When you eat certain foods does your tongue sting? Like with acidic foods, ie pineapple, tomatoes, etc...if so, classic geographic tongue. But, you really should see your dentist to make sure!!