The best replacement for tartar is plaque.

The best alternatives to tartar are rated as following:
★★★★★  plaque
★★★  calculus
★★★  baking powder
★★★  tartare
★★★  cavity
★★  tatar
★★  baking soda
★  tartar sauce
★  cornstarch
★  tartaric acid
★  tataki
★  cream
★  meringue powder
★  poke
★  citric acid
★  alum
  remoulade
  sashimi
  tartar
  ceviche
  plague

Your alternative for tartar is not listed? Suggest!
Speaking about tartar, one probably shouldn't forget about sulfur.

Other search terms related to tartar and their ratings are:
★★★★★ sulfur
★★ baking powder
★★ baking soda
You have in mind a companion for tartar and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of tartar in all years. Click on graph for more.
tartar
plaque
calculus