歯垢がずいぶん付いていると思いますが。

tooth

dirt; filth; grime; account (e.g. online service)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

very; extremely; surprisingly; considerably; contemptible; reprehensible

to be attached; to be connected with; to adhere; to stick; to cling; to remain imprinted; to scar; to stain; to dye; to bear (fruit, interest, etc.); to be acquired (of a habit, ability, etc.); to increase (of strength, etc.); to take root; to accompany; to attend; to follow; to study with; to side with; to belong to; to possess; to haunt; to be lit; to be lighted; to be settled; to be resolved; to be decided; to be given (of a name, price, etc.); to be sensed; to be perceived; to be lucky; to become (a state, condition, etc.)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

to think; to consider; to believe; to think (of doing); to plan (to do); to judge; to assess; to regard; to imagine; to suppose; to dream; to expect; to look forward to; to feel; to desire; to want; to recall; to remember