4. Give him a good toothbrush and ask him to try it out.
“I give it to him as a gift and say that I’m using it and it really works.” With a quality toothbrush, you can eliminate one potential cause of his bad breath by helping him improve his everyday oral care. You can also show him how to use it based on your experience, like, “I saw it on TV and this is supposedly the correct way of doing it.”