He switched to a different tool, one that held taut, half-inch lengths of floss between disposable U-shaped bits of plastic. They’d fixed his teeth, in Basel, and had sent him several times to a periodontal specialist. Curettage. Nasty, but now he felt like he had a new mouth, if a very high-maintenance one. The best thing about having had all that done, aside from getting a new mouth, was that he’d gotten to see a little bit of Basel, going out for the treatments. Otherwise, he’d stayed in the clinic, per his agreement.