1. Garlic

Contains sulfuric compounds that are absorbed into the bloodstream and travel to the lungs, where they are released when you exhale. This can cause bad breath for up to 24 hours after eating garlic.

2. Onions

Similar to garlic, onions also contain sulfuric compounds that can cause bad breath.

3. Coffee

Can cause dry mouth, which can lead to bad breath. Dry mouth reduces saliva production, which normally helps to wash away food particles and bacteria in the mouth.

4. Alcohol

Also causes dry mouth and contributes to bad breath. In addition, alcohol can break down the lining of the mouth, making it more susceptible to infection by odor-causing bacteria.

5. Canned Tuna and Other Fish

Fish, especially canned fish, can leave behind a lingering fishy odor. This is due to the breakdown of compounds in fish called trimethylamine (TMA) which produces a fishy smell.

6. High-Protein Foods

Breaking down protein during digestion can produce ammonia, which can contribute to bad breath.

7. Cruciferous Vegetables

Cruciferous vegetables, such as broccoli, cauliflower, and cabbage, contain sulfur compounds that can cause bad breath.

8. Citrus Fruits

The acidity of citrus fruits can create an environment in the mouth that is favorable for the growth of odor-causing bacteria.

9. Dairy Products

Dairy products, such as milk and cheese, can break down and leave behind a filmy coating on the tongue, which can trap odor-causing bacteria.

10. Spicy Foods

Spicy foods can irritate the throat and esophagus, which can contribute to bad breath. Additionally, some spicy foods, such as onions and garlic, also contain compounds that can cause bad breath.