Watch Glee Season 2 Episode 2 - Britney/Brittany Online: A trip to the dentist for the Glee clubbers gives them hallucinations while Brittany's psyche comes to focus and they sing some of special guest star Britney Spears' greatest hits.

When Brittany and the gang try to convince Mr. Schuester to let them do a Britney Spears number, he is reluctant to go that edgy. Meanwhile, an insecure Will is curious about Emma’s new beau, Dr. Carl Howell, so he convinces her to bring him in to talk to the kids about dental hygiene. While the dreamy doc inspires the girls to take their dental health more seriously, Will is left feeling worse than before.