I think that he may not eat many refined sugar products, although he drank wine and brandy for a couple of days during Thanksgiving celebrations, and evidently has a strong and active way of life. A real spunky critter.
BTW, a hearty equals eight minus zero to you too!
May be some genetics at work, too, I suppose. Mr. Mew's family is full of folks with thin and/or weak tooth enamel. Their teeth need all the help they can get. Maybe this gentleman you mentioned has really strong teeth. Wonder if he gargles and/or flosses?