The purpose of this study was to determine the anti-calculus effect of dentrifice containing 5% sodium pyrophosphate and potassium pyrophosphate in a triple-mask placebo controlled randomized clinical trial.

Inclusion Criteria:

1. Age group 15-30 years.
2. Subjects who have not received periodontal therapy within preceding 1year.
3. Heavy calculus formers with simplified calculus index score 1.5-3 .

Exclusion Criteria:

1. Age group 15-30 years.
2. Subjects who have not received periodontal therapy within preceding 1year.
3. Heavy calculus formers with simplified calculus index score 1.5-3 .