A Study of Tooth Erosion in People With Esophagogastric Cancer

Inclusion Criteria: * Subject is willing and able to provide written informed consent. * Patients with a history of esophagogastric, HNSCC, PDAC, CRC, or NSCLC or healthy controls * Patients must be able to fully comprehend and complete the survey and be willing to have pictures taken of their teeth with a camera or intra-oral camera. * Patients must be able to understand English language or have access to adequate translation services. * Age ≥ 18 years old. Exclusion Criteria: * Subjects without evaluable molars or with significant molar dental work precluding dentists from assessing enamel status, Note: evaluable is defined as having bilateral assessable mandibular molars, or erosions present in the remaining assessable quadrants. * For healthy controls only, patients cannot have a non-skin cancer history nor presenting for a procedure evaluating reflux symptoms.