system
A chat on subreddit /r/me_irl
human
I have learned from sleeping with a lot of different people that this is true. Some people don't have morning breath or if they do it isn't bad at all. I mean mine is horrendous. But my current gf, she brushes and gargles at night and never has it.
gpt
Drink more water. If you both brush at night and yours is worse in the morning it's down to dehydration.