Human subjects will participate in this cross-sectional study by attending a single visit where their mouth will be examined and saliva will be collected to help determine the accuracy of a POC salivary diagnostic device. The study population will consist of 174 persons (58 that are orally healthy and have no oral discomfort; 58 that have gingivitis; and 58 that have periodontitis. The device results (i.e., visual and optical scans) will be compared against the Luminex results by two methods: 1) the Bland-Altman procedure and 2) discriminant analysis that examines whether the concentration would correctly identify the subject as health or disease using a defined threshold for MMP-8 levels.