Our expert says:
Halitosis is quite often caused by problems of either the oral cavity, the nasal cavity or the digestion. Tooth decay, diseased gums, nasal infections, and a tendency to excrete sulphur-containing compounds after eating garlic and other members of the allium family (raw onions, chives) can cause such odours. I don't know if you should tell this person because he could be offended and resent your interference! You could get around to the subject indirectly by asking him if he can refer you to a good dentist - if he does not have a dentist you could suggest that it is a good idea to have a dental checkup at least once a year to prevent tooth decay and ensure that one's gums are healthy. Hopefully he will go for a checkup and the dentist will investigate the problem. I just hope this approach works.
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