The purpose of this study is to get images (pictures) of oral lesions, which occur inside the mouth, before the patient's surgery using a special camera. These pictures will be used in our research to evaluate a new technology that uses a laser and takes pictures of the microscopic structure of tissue. The technology is called "reflectance confocal microscopy." We would like to compare what the camera sees to biopsies (pathology) of the same area. We will evaluate the pictures obtained from the patient to determine whether this technology may be useful in the future. We hope this technology can be used as a tool for early diagnosis of oral cancers and for guiding surgery.

Inclusion Criteria:

• Patients with biopsy-proven oral SCC who are scheduled to undergo surgery in the MSK Head and Neck Service.
• Ability to sign informed consent.
• Age ≥ 18 years.

Exclusion Criteria:

• Cancer located on a site that may not be convenient or accessible for imaging with the current version of the RCM device (gingivobuccal region, back of the oral cavity, back of the tongue, floor of the mouth, deep under the tongue, etc.).
• Inability to give informed consent.

Potential research subjects in the Head and Neck Service will be identified by a member of the patient's treatment team, the protocol investigator, or a member of the research team at Memorial Sloan Kettering Cancer Center (MSK).