Causes of Bad Breath

Mouth Smell and its Causes
Bad Breath Treatment
Bad breath is noticed by an unpleasant smell, called halitosis, sometimes by you or people around you during the speech.

Causes of Bad Breath

The most common cause of gum disease, poor oral hygiene.
Some medications may cause dry mouth by decreasing salivary secretion and this can dissappear by changing medication.

During fasting, starvation  the body burns fat as a source and this causes ketone to occur.

And some ketons cause bad smell when they are thrown out of mouth.
Smoking, eating some food and drinking some beverages may cause bad smell.
Lung infections and tonsillitis may cause bad breath.
For some people, bad breath can be seen in the morning.This occurs because of the drying of mouth during night.After breakfast,depending on salivary secretion it is eliminated.