Is there a remedy for mothball breath odor?

Yes: This is caused by bacteria in the mouth, decay or gum disease. Brushing, flossing and tongue cleaning are essential to removing this bacteria. Start with a dental exam and teeth cleaning. Keep your mouth clean. And this should help. If there is still a breath problem then see md to evaluate medical causes, like sinus, postnatal drip, acid reflux, being the most common.