What causes bad breath?

Good breath is more than just a hygiene issue, it can lead to decreased confidence and cause self-image issues. It can also be indicative of bad habits that can lead to more serious dental problems, therefore it's absolutely vital that you diagnose and fix your breath problems!

The most likely causes of bad breath are the following:

Gastrointestinal problems or ulcers
Certain foods, such as garlic and onions (even brushing doesn't help sometimes!)
If you're on a diet, low carb intake can cause ketosis which induces bad breath.
Obesity

The best way to treat bad breath:

Make sure you brush your teeth and floss regularly.
Don't forget to brush your tongue!
You can use hydrogen peroxide as a mouth wash. A 3% solution of hydrogen peroxide has been approved by the FDA for use as a mouthwash, but be sure to follow the directions for your particular brand.