As with so many things with medicine, this question which sounds so straightforward unfortunately has no straightforward answer. After all, there have only been a few studies that have specifically looked to answer this question. And the answer is decidedly ambiguous as the few studies done so far either support or disprove this practice. Two studies have found no difference in recurrent infections whether one keeps using an old toothbrush or replaces it with a new one after a strep th…