the drug's ledger kept in the teeth
Smoking ’base cocaine eats teeth, corrodes teeth, attacks the enamel directly. Chandler Foss had explained all this to her at supper, showing her his corroded stumps.
Context
The body files the bill the mind ducked: freebase goes straight for the enamel, and the house's casualties carry the invoice in their mouths — stumps and blackened rows shown off over supper. The tell in the last clause is that these mouths frighten her worse than any meeting's testimony can; the horror the program narrates in words the pipe has already written in bone.