Sweet Tooth is a small-time crook with a pension for candy. Sweet Tooth like almost all Batman rogues from that era rely on gadgets, and weapons that fit their motif. He always uses candy to either escape or attack Batman and Robin.
In 1977, Sweet Tooth tries to change Gotham's water supply into chocolate and blackmail the city for five million dollars which he doubles to ten million after Robin makes a pun about his weight. His plot to blackmail Gotham into paying for their water back is foiled when Robin infiltrates Sweet Tooth's organization. Then Batman along with Batgirl find Sweet Tooth's water locking device and have him trapped along with his gang in his own taffy wade with his candy cannon. Sweet Tooth orders his henchmen to try and eat their way out, but the kids who cannot eat anymore give up. Batman then comments on sending Sweet Tooth to jail, and taking the children to the dentist and then to juvenile detention center.
- Sweet Tooth is a fictional villain made exclusively for The New Adventures of Batman.
- He appeared in only one episode: A Sweet Joke on Gotham City
- He wears a purple sweater and a yellow hat, and is clearly overweight.
- He uses children as henchmen who enjoy his gluttonous need for candy.