The first one is about just 1 tooth they found in a pool of 1000 extracted teeth. The second one says "there was a high association between gingivitis and plaqu

The first one is about just 1 tooth they found in a pool of 1000 extracted teeth. The second one says "there was a high association between gingivitis and plaque status with calculus accumulation" in the abstract, thus contradicting your earlier comment.