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1.
To thoroughly clean one's teeth before visiting the dentist for a teeth cleaning.
I ate a bag of Oreo's and then committed precrestination before going to my dentist appointment.
de The Wads 24 janvier 2007
 
2.
This is when someone who never brushes their teeth waits until special occasions to brush their teeth, like when they visit the dentist or plan on kissing someone.
Boy: Do you think precrestination is a bad habit?

Girl: Are you kidding me? You should be brushing your teeth everyday twice a day at least. If your a precrestinator, I'm out of here. Nasty ass pos
de CleanMouf 18 juillet 2011
 
3.
To thoroughly clean one's teeth before visiting the dentist for a teeth cleaning.
I ate a bag of Oreo's and then committed precrestination before going to my dentist appointment.
de The Wads 12 avril 2007