Romantic-comedy, I do not know the title but just the mine storry

The movie is about a girl, who whants a boyfriend, but when she see how they wash their teeth, she dumps them.

She realize her problem. With the last boy she trys all the way posible to avoid him, while he is washing his teeth, but at the end she see him and likes the way hi is doing it.

Can’t remember or find the title.