Every day, bacteria descend on the gumline and start organizing into biofilm. You have a water flosser.
Fresh plaque wipes right off. Plaque you leave alone links up, shields itself, and eventually calcifies into tartar — and no jet of water removes tartar.
On a phone: drag to move, hold to fire.
A game, not medical advice. The organism notes between days come from this practice's page on bacterial testing.
Plaque never stops coming back — that isn't a difficulty setting, it's the biology. The daily disruption is the game.
Plaque Invaders runs entirely in your browser, and this browser has scripts switched off. You can still read about the bacteria the game is built from.