87% of all bad breath originates in the mouth, the other major culprit is the digestive system (ENT causes 8%).
Source: Nogueira G, Pipelines for Halitosis, Oral Health, October 2011, Vol 101, No 10, pg 35-39
Hans Skariah, B.Sc., DMD
Promenade Court Dental Health Group in Mississauga
2233 Hurontario St., Mississauga, ON, Canada
(1/2 km north of the QEW in the Dome Building)