The next visit involved filling that canal and drilling a new one. First the dentist drills right into the affected canal inside the tooth. This is where the nerve lives. Once a tube has been hollowed out, they twirl around in there with a mini bristle brush (the kind you can buy to clean between teeth) of increasing diameter. If your teeth are close to the nerve, like mine are you swear you can feel it, despite the local anesthetic. This time I was charged 2,000 or 3,000 CZK. And the next appointment wasn´t for about another two months. Each subsequent appointment that involved the composite material cost the same, so in total the procedure cost around 8,000 CZK and lasted half a year. The tooth, a rear molar, looks and feels great now, so I´m satisfied.