plaque
A2CEFR level
20/100Rarity: fairly common
TechnicalRegister
A soft, sticky biofilm of bacteria that forms continuously on tooth surfaces and gum margins.
If plaque is not removed daily, it hardens into calculus that only a professional clean can shift.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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