system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If alcohol helps kill bacteria and fights bad breathe (like mouthwash), why does your breathe smell like death after a night of drinking ?
gpt
Because the alcohol doesn't kill ALL of the bacteria in there and those little greebly bastards reproduce right quickly. 

Then there's good odds that you didn't brush your teeth before passing out into a drunken stupor. That means there's all sorts of dilute sugar solution from the beer or wine that you drank (the alcohol would have evaporated away), coupled with oily residues and starches from the full bag of Doritos and breaded chicken wings that you ate earlier in the evening. This is wondrous foodstuff for the bastards and they go right to town, producing all sorts of atrocious-smelling byproducts as they digest them.