How could you offend someone?!
Question: How could you offend someone by not brushing your teeth or doing good hygiene EXPLAIN.
Answers: How could you offend someone by not brushing your teeth or doing good hygiene EXPLAIN.
You can offend or displease anyone at any time,by any way.
If you don't brush your teeth then it is definite that your mouth will emanate bad smell that can offend anyone,especially the kissing partner.
Not brushing teeth is unhygienic.
tell him/her, "you know what, you're breath stinks like mine does"
Are you asking how you can offend someone by not brushing your own teeth?
Maybe if the person was your dentist?