Derrick White got his pearly whites fixed amid his victory bender ... making time for a trip to the dentist to correct his chipped tooth ahead of the Celtics' championship parade!!
The breakout star revealed his new look ahead of the big bash in Boston on Friday ... saying he went through a lengthy procedure to get his smile right again.
Of course, White put it all on the line in Game 5 of the Finals -- he dove for a loose ball and got tangled up with Dallas Mavericks player Dereck Lively .