We turned to Mark Bianchi, M.D., ear, nose and throat specialist at Yale Medical Group. He writes:
“Bad breath or halitosis can come from chronic tonsillitis, acid reflux (GERD), allergies, smoking, diet, and lack of adequate dental care and oral hygeine.
“Consultation with a dentist or otolaryngologist may be helpful. Consideration of diet, particularly in the evening, may shed some light on this problem, especially if you are consuming coffee, alcohol or spicy foods.
“Bad breath in younger people often results from the tonsils. However, halitosis is often of unknown cause and can be more of a problem in older people.”