Jerry's dentist, Tim Whatley, has just converted to Judaism and is already making Jewish-themed jokes. Jerry, who is Jewish, tells a priest that he thinks Tim only converted for the jokes, and that Tim has also been telling Catholic-themed jokes, saying that he's offended not as a Jew, but as a comedian. However, the priest is unamused by a dentist joke that Jerry makes at the end of their conversation and tells Tim. Tim takes extreme exception to the dentist joke and deliberately prolongs an uncomfortable procedure. After hearing Jerry's complaints about Tim, Kramer calls Jerry a "rabid anti-dentite".
Kramer and Mickey Abbott double date, but can't decide which woman, Karen or Julie, is right for which one of them. Kramer decides on Karen, but changes his mind after meeting Karen's parents, who are revealed to be little people like Mickey.
George's new girlfriend Marcy likes to say "yada yada yada" to shorten her stories. He uses this practice to avoid mentioning Susan's death. Marcy tells him that her ex-boyfriend had visited her the night before "and yada yada yada, I'm really tired today." George consults Jerry and Elaine, suspecting that Marcy used "yada yada" to cover up sex with her ex-boyfriend. Later, George asks Marcy to tell him some of the things she was covering up with "yada yada", and discovers that she's a shoplifter.
Elaine is a character reference for Beth and Arnie, a couple who are trying to adopt. When she mentions Arnie's bad temper in the interview, the couple are rejected for adoption. Arnie pries the truth out of Elaine, but is afraid to tell Beth that he is responsible for their not getting a child. He uses "yada yada" to cover up the details of his meeting with Elaine, unwittingly making Beth think he cheated on her with Elaine. Elaine lobbies on behalf of Beth and Arnie, and sexually propositions the adoption official as an inducement. Beth's marriage fails and she accompanies Jerry to Mickey's wedding to Karen. Elaine, now dating the adoption agent, is dismayed and disgusted. George shows up without Marcy, who was arrested for stealing shoes. Julie runs out, apparently in love with Mickey and unable to bear seeing him marry Karen. Mickey's dad, a dentist, chastises Jerry for antagonizing Tim. Jerry is comforted by Beth, who harbors the same anti-dentite feelings towards dentists as he does, but also reveals she is racist and antisemitic. As Karen and Mickey walk out at the end of the ceremony, Karen says to Kramer, "I really wanted you."