A typical cavity filling takes about an hour or less from start to finish. Simple, small fillings can be done in as few as 20 minutes, while larger or more complex cavities push closer to the full hour. If you’re getting multiple fillings in one visit, expect to be in the chair for one to three hours.
What Happens During the Appointment
A filling appointment follows a predictable sequence: numbing, removing decay, placing the filling material, and shaping it to match your bite. Most of the time you spend in the chair isn’t the actual filling placement. It’s the numbing and preparation that take up the bulk of your visit.
Your dentist starts by injecting a local anesthetic around the tooth. This takes a few minutes to kick in, and your dentist will usually wait until the area is fully numb before starting. Once you can’t feel anything, the decayed portion of the tooth gets drilled away. The cleaned-out cavity is then filled, shaped, and polished. For a straightforward single-surface cavity, the whole process can wrap up in 20 to 30 minutes. Deeper cavities or those on hard-to-reach back teeth take longer because there’s more decay to remove and more filling material to place.
How Filling Material Affects Time
The type of material your dentist uses makes a measurable difference in how long you sit in the chair. Tooth-colored composite resin fillings take about 10 to 20 minutes longer to place than traditional silver amalgam fillings. That’s because composite is applied in thin layers, with each layer hardened individually using a curing light. Amalgam, by contrast, gets packed into the cavity in one step.
Most dentists today default to composite for visible teeth because it blends in with your natural tooth color. Silver amalgam is still used for some back teeth where durability matters more than appearance. If appointment length is a concern, it’s worth knowing that choosing composite adds time, but the difference is modest for a single filling.
What Makes a Filling Take Longer
Several factors can push your appointment past the one-hour mark. The size of the cavity is the biggest one. A small cavity on the flat surface of a tooth is quick work. A large cavity that spans multiple surfaces of the tooth, or one that extends deep toward the nerve, requires more careful removal and more filling material. Location matters too. Front teeth are easier to access than molars tucked in the back of your mouth, and your dentist needs more time to work in tight spaces.
If you need more than one filling, your dentist can often do two to four in a single appointment. That typically stretches the visit to one to three hours depending on the size and location of each cavity. Grouping fillings on the same side of your mouth is common because it means only one round of numbing.
What to Expect After the Filling
The numbness from the anesthetic typically wears off within about two hours. During that window, your lips, cheek, or tongue on the treated side will feel tingly and unresponsive. Eating and drinking while numb is a bad idea. You’re likely to bite your cheek or tongue without realizing it, and liquids tend to dribble. Plan to eat beforehand or wait until the feeling comes back.
Some sensitivity to hot and cold temperatures after a filling is normal. For shallow to moderate fillings, this usually resolves within one to two weeks, with the sensitivity fading gradually over that period. Deeper fillings that come close to the tooth’s nerve can cause mild sensitivity for three to four weeks before fully settling down. If sensitivity gets worse instead of better, or if you feel a sharp pain when biting down, that’s worth a call to your dentist. It could mean the filling sits slightly too high and needs a quick adjustment.
How to Plan Your Schedule
For a single filling, block off about 90 minutes total. That gives you time for check-in, the procedure itself, and a few minutes afterward while you get your bearings. If you’re having multiple fillings done, ask the office when you book how long they expect the appointment to run so you can plan accordingly.
Most people go back to work or school the same day. The filling itself doesn’t limit your activity. The only real inconvenience is the lingering numbness, which can make talking and smiling feel awkward for a couple of hours. If your job involves a lot of speaking or client-facing interaction, you might prefer a late-afternoon appointment so the numbness wears off at home.