I dated this guy about a year ago. I liked him until he opened his mouth..the odor wasnt foul, but it wasnt pleasant either. I have been with him after he brushed his teeth and the smell was still there, just a little masked.. I am assuming he had halitosis.. what can be done about that if brushing wont work? And how is it caused? Can it be spread?

Can gingivitis be healed simply by brushing and flossing often?