If you have bad breath despite brushing your teeth and using mouthwash twice a day, there could be several possible causes. It's a good idea to first visit your dentist to rule out any oral issues like tooth decay. Quitting smoking can also help improve bad breath. Making sure your mouth doesn't become too dry is important, as dryness can lead to bacteria growth and bad breath. Additionally, consider looking into your digestion as sometimes bad breath can originate from there. Overall, addressing these potential causes can help improve your breath.