The purpose of this study is to test the ability of OncAlert™ to screen for cancer and the reappearance of cancer. OncAlert™ was developed by Vigilant Biosciences, a collaborator in this research study. OncAlert™ is an oral rinse which is spit into a cup and sent to a laboratory for analysis. OncAlert™ is considered experimental by the FDA because it is not approved for the screening of cancer.