Plot Glee club director Will Schuester (Matthew Morrison) attempts to set New Directions an easy listening adult contemporary assignment, but Kurt (Chris Colfer) informs them there is a Facebook group petitioning the club to perform a Britney Spears number at the McKinley High homecoming assembly. Will refuses, stating that Spears is a bad role model. He is supported by club member Brittany (Heather Morris), who reveals that her full name is Brittany Susan Pierce (calling herself Brittany Spierce) and as such she has always been dismayed that she will never be as successful as the similarly named pop star. Will then discusses Spears with school guidance counselor Emma Pillsbury (Jayma Mays). While in her office, he meets her new boyfriend, dentist Carl Howell (John Stamos), who offers to talk to the glee club about dental hygiene. A plaque test reveals that Brittany, Rachel (Lea Michele) and Artie (Kevin McHale) all require dental work. When Brittany is put under general anesthesia so Carl can fill her cavities, she experiences a hallucination in which she performs Spears' "I'm a Slave 4 U". She later returns to Carl's practice with her friend Santana (Naya Rivera) and they share a hallucination in which they duet on "Me Against the Music". Brittany feels empowered by the encounter, and begins to act more assertively in glee club. Rachel feels threatened by her boyfriend Finn's (Cory Monteith) desire to re-join the school football team, fearing that their relationship will not work if he becomes popular again. After visiting the dentist and experiencing her own hallucination, in which she performs "...Baby One More Time", Rachel begins dressing more provocatively. Her new look is received positively and cheerleading coach Sue Sylvester (Jane Lynch) finds school blogger Jacob Ben Israel (Josh Sussman) masturbating to a video of Rachel in the library. Rachel relents and encourages Finn to re-join the team. Artie's dental visit results in a hallucination of "Stronger" in which he is also a member of the football team. Football coach Shannon Beiste (Dot-Marie Jones) accepts both Finn and Artie, despite the fact Artie is in a wheelchair. Rachel becomes jealous of the attention Finn is receiving now that he is back on the team and to test Finn's fidelity, she has his ex-girlfriend Quinn (Dianna Agron) attempt to seduce him. She is relieved when Finn turns Quinn down, and sings Paramore's "The Only Exception" to him in apology.