I have bad breath at the morning even if i brush twice a day and gargle mouth wash , does blocked nose affect this? coz mostly i have blocked nose

Sinus infection ?: Dry mouth? Post nasal drip? All can contribute, as well as cavities, periodontal problems, and acid reflux. Please address all of these possibilities.

See a dentist: In the majority of cases, the cause of bad breath, or halitosis, is the product of bacteria in the mouth and gum disease. The proper diagnosis is the key to a successful treatment. See your dentist for Halimeter test, diagnosis and bad breath treatment that depends on its cause. Good luck.

Stomach, lungs: Digestive and pulmonary issues need to be considered/ruled out also