Before Curtis Granderson steps into the batter's box Friday night ... he needed a visit to the dentist's chair -- 'cause dude JACKED UP his tooth sliding into second base Wednesday!!
You'll remember ... The Grandy Man legged out a double in the 9th inning of the Brewers' Game 5 loss to the Dodgers -- and his helmet whacked him square in the mug on the slide.
Curtis ended up with a fat lip AND a broken front tooth to go along with the L ... and even said afterward the chipped piece got STUCK IN HIS LIP!