People who have bad breath due to sinus issues must treat their sinus problems to eliminate their bad breath, according to MedicineNet. People with sinus issues can get temporary relief from bad breath by using mouthwash or by chewing on gum, mint or parsley.
Before treating bad breath due to sinus issues, individuals should first consult with their doctors to verify that sinus problems are the cause, advises the American College of Allergy, Asthma & Immunology. Once the diagnosis is confirmed, doctors treat the sinus issue based on its cause. Doctors prescribe antibiotics for a period between three and 28 days for patients diagnosed with bacterial sinusitis. Patients suffering from bad breath due to sinus issues can also use nasal decongestant sprays to shrink nasal passages and facilitate the flow of drainage from the sinuses.
People with bad breath due to sinus issues related to allergies can take antihistamines to block the inflammation of nasal passages, according to the American College of Allergy, Asthma & Immunology. Topical nasal corticosteroids prevent inflammation and swelling in the nasal passages, while nasal saline washes help clear blockages of the nasal passages that lead to sinus issues that cause bad breath. For more serious medical problems that lead to chronic sinus issues, such as anatomical defects and nasal polyps doctors may recommend surgery.