….I switched dentists the other day and, for the first time in more than 30 years, the hygienist presented a cup with four little pills….yes, routine, preventive, antibiotic therapy.  The explanation was that I’d undergone hip surgery in 1980 and there was a danger of infection when she cleaned my teeth.  Never mind  that I had somehow survived almost four decades of dental work, including extractions, crowns and the like, without antibiotics…the young woman and the older dentist were insistent. So I did what any obedient subject of modern medicine would do:  I palmed the pills and threw them away later.  But I wonder, as with red meat and red…