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Clinpro Cario L-Pop (CCLP) is a semiquantitive test claimed to determine the general potential for caries development and to monitor the individual caries risk. This test translates the capacity of the tongue microflora to produce lactic acid into a score of 1–9, indicating a low, medium or high risk for caries development. The aim of this randomized crossover, clinical trial was to evaluate the CCLP on its variation over time and its capacity to monitor the effect of three different oral hygiene procedures. The CCLP readings were compared with measurements of lactic acid in tongue biofilm and plaque samples by capillary ion electrophoresis (CIA). After four washout periods, the distribution of scores in the low-, medium-, and high-risk categories was 10%, 16%, and 74%, respectively. Out of 30 subjects, 11 scored consistently in the same category. The coefficients of variance of lactic acid concentrations were 31% for tongue samples and 25% for plaque samples. After using antimicrobial toothpaste and mouthwash, the number of high-risk scores was reduced to 33%; reduced acidogenicity was also found in tongue and plaque samples. We conclude that CCLP can be used to monitor and stimulate compliance to an antimicrobial oral hygiene protocol.