More than half of the population wakes up with bad breath.(Morris & Read 1949). This does not deserve special attention, since it is caused by night xerostomia (dry mouth). Salivary flow reduced to a minimum and active intraoral decomposition during the night explain morning breath. This will disappear quickly after eating food or drinking liquids. Remember that brushing your teeth, flossing and scraping your tongue will considerably reduce the morning breath.

First consult a dentist you trust and see if there are cavities, gum and periodontal disease or non-cleaned tongue, which may the responsible for the halitosis. If there is no problem in the oral cavity, consult a general practitioner to find the cause.

87% of the causes come from the mouth, 8%  from the ear, nose throat areas and 5% from certain body parts, such as liver, kidneys, bronchi (carcinoma), etc.(Delanghe et al. 1997)

Consult your dentist. If the problem does not come from the mouth, you should consult a general practitioner.