calculus
B2CEFR level
40/100Rarity: uncommon
TechnicalRegister
Hardened, mineralised plaque that adheres firmly to the teeth and can only be removed by scaling.
There is a heavy build-up of calculus behind your lower front teeth that I'll remove with the ultrasonic scaler.
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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