[Friends Season 1x20]  - The One with the Evil Orthodontist

"The One With The Evil Orthodontist" is the twentieth episode of the first season of Friends, which aired on April 6, 1995.

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Although Barry is marrying Mindy, he's still in love withRachel. He goes out on a date with her again, which makes Rachel realize she may not be over him yet. When she tries to break up with him, she ends up having sex with him in his dentist's chair. Later, Mindy calls her to talk to her, and asks her to be her maid of honor, which Rachel accepts. However, Mindy also mentions that she thinks Barry's cheating on her, which makes Rachel admit her affair.
Chandler is going nuts about a woman he likes but won't return his phone calls. Although they've only gone out on one date, he's reluctant to show her how needy he is, and tries to play cool over the phone. When she comes over at the coffee house to meet him in person, she explains how she had his number wrong. Although the guys interpret this as a nice gesture, Chandler thinks it's needy.
Meanwhile, a Sidney Marks is spying on the friends from Ugly Naked Guy's building with a telescope. WhenJoey gets the phone number, he discovers that Sidney is a woman. It only takes a few words over the phone for their rage to go away, as they find her compliments charming enough to hold a civil conversation with her.