*3.2.3 Calcium*

When we search for studies that have explored the detection of calcium present in saliva as a biomarker, we find that while some studies report the usefulness of calcium because the subjects in the periodontitis group had significantly higher levels of salivary calcium than gingivitis and healthy group [68, 69], another work find that high salivary calcium content can be correlated with good dental health but not with periodontal bone destruction [70].
