>I been trying that inhaling of Hydrogen Peroxide 3% thing
You realize you're just breathing in oxygen free radicals, right?
If you really want your breath to be better, get some water-based ivermectin (syringes have small tip instead of open end), and swish it in your mouth as long as possible before swallowing.
H202 decays to H2O plus O
The single O is what you're breathing, also known as an oxygen free radical.