Half a Tablet Cleans as the Label Fears It Might Not: Concentration, Soak Time, and Cost in Denture Cleansing

Denture cleansing tablets are used one per soak by label instruction, and halving them is a common household economy of unknown effect. This study evaluates dose and soak time together under a stated concentration-time criterion of 3.0 normalised units, where a whole tablet in 150 mL defines a concentration of 1.00 and a half tablet 0.50. A whole tablet reaches the criterion at 30 minutes (3.0 units); a half tablet reaches it at 60 minutes (3.0 units) and exceeds it eightfold overnight at 480 minutes (24.0 units). Halving the tablet for overnight soaking saves USD 21.90 per wearer per year at a stated tablet price of USD 0.12. This study is simulated, not measured. SIMULATED, NOT MEASURED.