Yogurt. And som Google things to read..

Yogurt, besides being an excellent source of Calcium, is a great source of reducing bad breath. The reason for this is that yogurt is considered quite helpful in reducing the levels of Hydrogen Sulfide stored in different parts of our mouth. Hydrogen Sulfide causes bad breath.

Exposure to hydrogen sulfide gas can occur in the home and in the workplace. In the home, exposure may occur because of faulty plumbing. Sewer drains that have dry traps can allow hydrogen sulfide gas to enter the home.