Bad breath

What causes it: Halitosis—a.k.a. stinky breath—comes from certain gasses released from your body or by bacteria, either in your mouth or your sinuses. 

What to do: Treating the underlying cause, such as a sinus infection or a digestion issue, may be the fastest way to fix the problem. But if your bad breath is persistent, talk to your dentist to rule out gum disease, plaque, or gingivitis. Brushing and flossing your teeth daily can keep harmful bacteria at bay, and avoiding foods with potent odors (such as garlic, onions, and coffee) may help as well.