A dentist diagnoses, treats, and prevents diseases of the teeth, gums, and mouth. That covers a surprisingly wide range of work, from routine cleanings and cavity fillings to screening for oral cancer and fitting crowns. Most people interact with a general dentist, who handles the majority of everyday dental care and refers patients to specialists when something falls outside their scope.
Exams, X-Rays, and Diagnosis
The core of what a dentist does starts with figuring out what’s going on inside your mouth. At a routine visit, your dentist visually examines your teeth, gums, tongue, and the soft tissues of your mouth. They check for signs of decay, gum disease, and abnormalities that could signal something more serious. This includes oral cancer screenings, where they look for unusual sores, discoloration, or lumps.
X-rays are a major diagnostic tool. Digital X-rays, now standard in most offices, use 80% to 90% less radiation than the older film-based versions. Panoramic X-rays capture your entire mouth in a single image, showing teeth, jawbone, nerves, and sinuses all at once. Some practices now use FDA-cleared AI software that analyzes X-rays to help detect cavities that might be easy to miss with the human eye alone. Your dentist uses all of this information to build a treatment plan tailored to what your mouth actually needs.
Cleanings and Preventive Care
Preventing problems before they start is a major part of a dentist’s job. Professional cleanings remove plaque and tartar buildup that regular brushing and flossing miss, especially in hard-to-reach areas along the gumline and between teeth. Your dentist or hygienist also measures the depth of the pockets around your gums using a small probe, which helps catch early signs of gum disease.
Dental sealants are another preventive tool. These are thin coatings painted onto the chewing surfaces of back teeth, where decay most often starts. The process takes just a few minutes per tooth: the surface is cleaned, dried, coated with the sealant material, then hardened with a curing light. Sealants are especially common for children and teenagers but can benefit adults too. Fluoride treatments, which strengthen enamel and make it more resistant to acid, are another routine preventive measure.
Patient education is woven into nearly every visit. Your dentist will point out areas where your brushing or flossing could improve and recommend products or techniques based on what they see in your mouth.
Fillings, Crowns, and Restorative Work
When a tooth is damaged by decay, a crack, or an injury, general dentists handle most of the repair work. The most common procedure is a filling. Your dentist removes the decayed portion of the tooth, then fills the hole with a tooth-colored composite material that blends in with your natural enamel.
Crowns are used when a tooth is too damaged for a filling to hold. Your dentist shaves down part of the natural tooth to create a base, then places a custom-made cap over it. This restores the tooth’s shape, strength, and appearance. Bridges work on a similar principle but replace a missing tooth entirely. The teeth on either side of the gap are shaved down, and a bridge (with crowns on either end and an artificial tooth in the middle) is bonded into place.
Root canal therapy handles infections deep inside a tooth. Your dentist removes the diseased pulp, which contains the tooth’s nerves and blood vessels, then cleans and disinfects the interior. The empty canals are filled with a rubber-like material and sealed to keep bacteria out. A crown usually goes on top afterward to protect the weakened tooth. Despite its reputation, modern root canals are typically no more uncomfortable than getting a filling.
Sedation and Pain Management
Dentists are trained to safely administer anesthetics and sedation. Local anesthesia, the numbing injection you get before a filling or extraction, is the most common form of pain control. For patients with dental anxiety or those undergoing longer procedures, sedation options go further.
Nitrous oxide (sometimes called laughing gas) is the mildest option. You breathe it in through a mask, feel calm within three to five minutes, and your dentist can adjust the level throughout the procedure. Once it’s replaced with pure oxygen at the end, the effects wear off quickly. Oral conscious sedation involves taking a prescription pill about an hour before your appointment, which makes you drowsy but still awake. IV sedation is the deepest form of conscious sedation available in a dental office, delivered directly into your bloodstream through an IV line while your heart rate and blood pressure are monitored.
Monitoring Growth and Development
For children and adolescents, a dentist tracks how the teeth and jaws are developing over time. This includes watching for crowding, misalignment, problems with how the bite fits together, and whether wisdom teeth are likely to cause issues. Routine visits starting at age one give dentists a baseline to spot problems early, when they’re often simpler to address. If orthodontic treatment or surgical intervention is needed, your general dentist refers you to the appropriate specialist.
The Oral-Body Health Connection
Your mouth can reveal a lot about the rest of your body. Dentists are often the first to notice signs of conditions like diabetes, autoimmune disorders, and nutritional deficiencies because these diseases frequently show up as changes in the gums, tongue, or oral tissues. Gum disease in a child, for example, can sometimes be a sign of an underlying systemic condition that warrants a referral to a physician.
The American Dental Association actively encourages collaboration between dentists and other healthcare providers to support patients whose oral health and overall health are intertwined. Your dentist reviews your full medical history before treatment planning, which is why those health questionnaires at every visit actually matter.
When Specialists Get Involved
General dentists handle a broad range of care, but some conditions require advanced training. The ADA recognizes several dental specialties, and your general dentist acts as the coordinator who identifies when a referral is needed.
- Endodontists focus on the interior of the tooth. They handle complex root canals and treat injuries to the dental pulp.
- Periodontists specialize in the gums and bone that support your teeth. They treat advanced gum disease and place dental implants.
- Oral and maxillofacial surgeons perform surgical procedures involving the mouth, jaw, and face, including wisdom tooth extractions, corrective jaw surgery, and treatment of facial injuries.
- Orthodontists correct misaligned teeth and jaws using braces, aligners, and other devices.
Education and Training Required
Becoming a dentist typically requires at least three years of undergraduate education followed by four years of dental school. Graduates earn either a DDS (Doctor of Dental Surgery) or DMD (Doctor of Medicine in Dentistry) degree. Despite the different names, these are the same degree with the same curriculum requirements. The title simply depends on which university grants it.
After dental school, every dentist must pass a national written exam and a state or regional clinical licensing exam before they can practice. Those who want to specialize in areas like oral surgery, orthodontics, or periodontics complete additional years of post-graduate training beyond that. By the time a general dentist sees their first patient independently, they’ve had at least seven years of higher education and clinical training.