Hi Huge Jassole, sorry for taking so long to answer your question.I am new here so I didnt know the answer. Below is information about dentist Tim Whatley that I could find. I see nothing about there being two of them. You might be thinking of Lloyd Braun?
take care, julie
Dr. Tim Whatley, played by Bryan Cranston ((Malcolm in the Middle): a dentist, nicknamed "Dentist to the Stars". In "The Yada Yada," he converts to Judaism, according to Jerry, just for the jokes. Jerry's anger at Whatley causes Kramer to call him an "anti-dentite". His giving Jerry a label maker he received from Elaine in the episode "The Label Maker", leads to the term regifting. In "The Jimmy", Whatley irks Jerry by having Penthouse magazines in his waiting room and by possibly 'violating' him while he was unconscious during a tooth filling.