Quickcare.org describes how methamphetamine causes halitosis–
How does methamphetamine cause bad breath?
Methamphetamines increase the acid content of stomach fluids and saliva. The acid damages the teeth, which can lead to bad breath. It also decreases the amount of saliva in the mouth. Dry mouth can cause bad breath.
How else can methamphetamine cause bad breath? Meth users tend to grind their teeth and they also crave sugar. Grinding the teeth and eating excessive sweets leads to very poor condition of the teeth. Bad teeth tend to equal bad breath.
Can methamphetamine cause bad breath in other ways? It mainly causes bad breath by damaging the teeth. However, it is harmful to the whole body, and as it affects the internal organs, it can cause bad breath due to problems in the digestive tract as well.
Which leads us to the Green Day tune, “Geek Stink Breath”–
GEEK STINK BREATH
I’m on a mission
I made my decision
To lead a path of self destruction
A slow progression
Killing my complexion
And it’s rotting out my teeth
I’m on a roll
No self control
I’m blowing off steam with methamphetamine
Don’t know what I want
That’s all that I’ve got
And I’m picking scabs off my face