Modified internal bleaching of severe tetracycline discoloration: a 6-year clinical evaluation

Since 1985, 534 severely discolored teeth have been treated with intentional endodontics and internal bleaching; of these, 258 were treated with the conventional technique and 276 were treated with the modified technique. Six years of clinical and radiographic evaluation revealed that the results obtained with the first group (conventional technique) remain stable and that a very noticeable improvement has been achieved with the second group of teeth, treated with the modified technique.