“One of the effects of exercise can be dehydration, which can lead to a dry mouth,” says Sienna Palmer, DDS, of Palm Dentistry in Orange County, CA. “Halitosis—what we call bad breath—is enhanced by dry mouth and dehydration, so it’s likely that you could experience some post-exercise halitosis yourself if you’re not adequately hydrated.”
How you’re breathing during exercise matters, too. “Those who breathe through their mouths during a workout would have drier mouths,” says Dr. Cohen. Another reason to breathe through your nose? You can create an additive effect wherein, you're exercising outside in dry air and you're dehydrated. Picture this: You're running outdoors...in dry winter weather...mouth breathing...and you're a little on the dehydrated side. It's the perfect storm of stinky breath.
Fortunately, the fix is simple, says Dr. Cohen. You need to rehydrate “Drinking water and electrolytes during your workout will help combat this,” she says. Water will totally cut it, but if you’re combatting some serious stench (and serious dehydration), you may want to step it up a notch, “You’ll want to replenish essential minerals like potassium and sodium in an oral rehydration solution formula; this type of formula pulls water directly into your cells and rehydrates your body as quickly as an IV.”
If you’ve done your hydrating, you took your electrolyte formula, and you’re still dealing with halitosis, it’s time to see your dentist, says Dr. Palmer. “Chronic halitosis may indicate something is wrong with your teeth or gums, so it’s important to get in for a checkup with your dentist if you fall into this category.”
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