Bad breath denies me a bank job

Any big supermarket will sell tongue scrapers. Flossing involves using a dental floss to clean in between your teeth. It's a bit tricky, but dentists will swear that it is more important than even brushing. You can also get it at a big supermarket or preferably at a pharmacy. Ensure that it is the waxed kind (to avoid cutting your gums)- it's written on the body. To learn the trick of flossing, you can google it e.g.
YouTube - ‪Floss Teeth and Gums How to Floss Properly Video‬&rlm;
How To Floss Properly by Dr. Natalie Ann Amann
How to Floss Properly | eHow.com