One thing that is very important for all is having a good breath. It would be very annoying if you are speaking with someone and he or she is covering his nose or somehow keeping a considerable distance from you.
No one would like to experience toothache too, so better yet, brush your teeth three times a day and visit the dentist regularly. Yes, having a good breath is just a matter of good oral hygiene. It is not a gift. It involves hard work. 