The current review provides some information on the major respiratory illnesses and their oral symptoms. Many systemic illnesses and abnormalities initially manifest in the mouth. Therefore, a prompt diagnosis by a dental expert might result in a prompt referral to the appropriate healthcare physician. The oral cavity is clinically and/or therapeutically involved in many pulmonary disorders, including respiratory obstructive diseases, systemic diseases with pulmonary involvement, lung cancer, cystic fibrosis, and tuberculosis. This highlights the significance of routine dental visits, a thorough oral cavity examination, and active collaboration between dental professionals and pulmonologists. To diagnose pulmonary disorders early enough for patients to benefit fully from treatment, oral symptoms are frequently necessary.