Oral cancer is treated primarily through surgery, radiation therapy, or a combination of both, often with chemotherapy or immunotherapy added for more advanced cases. The specific treatment plan depends on where the cancer is located in the mouth, how large the tumor is, and whether it has spread to lymph nodes or other parts of the body. Early-stage oral cancers can often be treated with surgery alone, while later stages typically require a combination of approaches.
Surgery for Early and Advanced Stages
Surgery is the most common first-line treatment for oral cancer. The goal is to remove the entire tumor along with a margin of healthy tissue around it. For small, localized cancers, this may be a relatively straightforward procedure. For larger tumors, surgery can be more extensive, sometimes requiring removal of portions of the jawbone, tongue, or floor of the mouth.
When a tumor sits close to the jawbone, surgeons may perform what’s called a composite resection, removing the tumor, nearby lymph nodes, and part of the jaw in a single operation. This is sometimes necessary to ensure no cancer cells are left behind at the edges of the surgical site. After surgery, pathologists examine the removed tissue for features that signal a higher risk of the cancer returning: cancer cells at the margins, spread into surrounding nerves or blood vessels, or involvement of lymph nodes. If any of these are present, additional treatment with radiation or chemotherapy is typically recommended.
Lymph node removal in the neck is common even when there’s no obvious sign of spread, because oral cancers frequently travel to nearby lymph nodes before symptoms appear. A modified neck dissection removes the lymph node chains while preserving key muscles and nerves, which limits the physical impact compared to a more radical dissection that removes everything from the jawline to the collarbone.
Reconstruction After Surgery
When surgery removes a significant amount of tissue, reconstructive surgery usually happens in the same operation. Surgeons take a “free flap,” a block of skin, tissue, muscle, or bone from a donor site elsewhere on the body, commonly the lower leg (fibula) or forearm. This tissue is carefully attached to the surgical site, with blood vessels reconnected under a microscope. The result restores both structure and function, helping with speaking, swallowing, and appearance. Recovery time in the hospital varies depending on the extent of reconstruction, and full healing can take several weeks to months.
Radiation Therapy
Radiation uses high-energy beams to destroy cancer cells. For oral cancer, it can serve as the primary treatment for tumors that are difficult to reach surgically, or it can follow surgery to kill any remaining cancer cells. The most common approach is external beam radiation, where a machine directs precisely targeted beams from outside the body. In some cases, radioactive material is placed directly inside or near the tumor, a technique called brachytherapy.
Current guidelines recommend starting radiation within six weeks of surgery when it’s used as a follow-up treatment. Delays beyond that window can reduce its effectiveness. For certain HPV-positive cancers of the throat and back of the mouth, doctors may be able to use a lower radiation dose (around 50 Gy instead of the standard higher doses), reducing side effects without sacrificing outcomes. This “de-escalation” approach applies to patients who meet specific criteria, including small tumors with clean surgical margins and limited lymph node involvement.
Dental Care Before Radiation
One often-overlooked step happens before radiation even begins. Radiation to the mouth and jaw permanently changes blood flow to the bone, which means dental problems that develop later can be much harder to treat. You’ll go through a thorough dental evaluation where any teeth with a poor prognosis are extracted, infections are treated, and custom fluoride trays are made. These trays deliver concentrated fluoride directly to your teeth after treatment ends, helping prevent the rapid decay that radiation can cause.
This dental preparation also reduces the risk of osteoradionecrosis, a serious complication where irradiated jawbone fails to heal and begins to break down. The overall risk of this complication is relatively low, around 3 to 7 percent in the first two years after radiation, but it’s significantly harder to treat than to prevent. Careful radiation planning that limits the dose to the jawbone keeps the risk below 5 percent for most patients.
Chemotherapy
Chemotherapy is rarely used alone for oral cancer. Instead, it’s paired with radiation (called chemoradiation) to make the radiation more effective. Platinum-based drugs are the standard choice for this role. Chemoradiation is most commonly recommended for advanced cancers or when surgical margins come back positive, meaning cancer cells were found at the very edge of the removed tissue. It’s also used when the cancer has spread to lymph nodes with extension beyond the node capsule.
Immunotherapy and Targeted Therapy
For oral cancers that have recurred or spread to distant parts of the body, immunotherapy has become an important option. These drugs work by blocking a protein called PD-L1 that cancer cells use to hide from the immune system. Your tumor will be tested for PD-L1 expression using a combined positive score (CPS). If your score is 1 percent or higher, immunotherapy drugs like pembrolizumab may be offered either before and after surgery, or combined with chemoradiation.
Targeted therapy drugs, which attack specific molecules that cancer cells depend on to grow, are also approved for head and neck cancers. These include drugs that block growth factor receptors on the surface of cancer cells. Both immunotherapy and targeted therapy tend to have different side effect profiles than traditional chemotherapy, often with less nausea and hair loss but with their own set of immune-related side effects like skin reactions, fatigue, and inflammation.
Managing Long-Term Side Effects
Treatment for oral cancer can affect eating, speaking, and appearance in ways that persist well beyond the treatment period. Radiation commonly causes dry mouth, difficulty swallowing, and changes in taste. Many of these improve over months, though some degree of dry mouth can be permanent.
Osteoradionecrosis remains a risk for years after radiation. If you need dental extractions after completing radiation, a combination of pentoxifylline (a blood flow enhancer) and vitamin E taken before and after the procedure has been shown to cut the risk significantly, from about 11.5 percent down to 3.4 percent. Hyperbaric oxygen therapy, once routinely recommended before post-radiation dental work, is no longer considered necessary for most patients based on current evidence.
Survival by Stage
How well treatment works depends heavily on how early the cancer is caught. Based on data from the National Cancer Institute’s SEER database covering 2016 through 2022, the five-year relative survival rate for oral and pharyngeal cancers caught at a localized stage is 88.7 percent. When the cancer has spread to nearby lymph nodes (regional stage), that drops to 69.7 percent. For cancers that have spread to distant organs, the five-year survival rate is 36 percent. These numbers underscore why early detection and prompt treatment make such a substantial difference in outcomes.