Do you know these words?

• あか

  dirt

• しこうじょきょ

  plaque removal

• しせきじょきょ

  scaling

• たまる（あかが〜/よごれが〜）

  to be covered with (grime/dirt) ; to have grime/dirt in -

• ふけつこうい

  nasty conduct ; unclean acts