Dr. Teeth only sings lead vocals on the second Muppet pilot and during the first season and these songs were only written before Rowlf the Dog had become firmly established as the regular Muppet pianist. Later performances mostly feature lead vocals by Floyd or Janice and only a few featured Dr. Teeth. His speaking roles got even smaller after his performer Jim Henson's death; an exception was the 1991 Muppets stage show "Muppets on Location: Days of Swine and Roses", the voice being performed by John Kennedy. He performed Dr. Teeth from 1991 to 2003 but made only very brief appearances with very little dialogue, some examples being the 1999 film "Muppets from Space" and once in the music video for the We Are Family charity song in 2002. Bill Barretta took over the role beginning with "The Muppets' Wizard of Oz" so that Kennedy could start performing Floyd instead following the retirement of Jerry Nelson, Floyd's original performer (although Matt Vogel later assumed the role of Floyd as well as most of Nelson's primary Muppet characters). Dr. Teeth's first major speaking role since Henson's death was in Statler and Waldorf's very own show, "" where Victor Yerrid performed him. Bill Barretta, however, has been performing Dr. Teeth consistently since 2005.