It is the province of a gentleman to cultivate a few eccentric tastes. Nothing too edgy, of course, but you should be able to think of at least one thing that is entirely yours. Even if it’s only your toothpaste.
This one (via NotCot) should give your mouth a pleasantly anesthetized feeling, but we bet you’ll swear by it by the time you finish the tube. And you’ll be one of the few who does.