Besides offering free copies of Plants vs. Zombies for its Stop Zombie Mouth campaign, Popcap and the American Dental Association have added 1 million trading card packs to the mix as well.

The packs are being distributed at participating dentists nationwide. They feature 45 different zombie types, including some not found in the game, and five characters representing germs found in the mouth.

Also with the cards is a card with a redemption code for the game and two mystery puzzles that can be built with specific cards.

PopCap did add that the trading cards may be available later on through different means.