A standard dental filling takes about an hour or less from start to finish. Simple fillings on small cavities can be done in as few as 20 minutes, while larger or more complex fillings push closer to the full hour. Several factors determine where your appointment falls in that range, including the filling material, the size of the cavity, and how many teeth need work.
What Happens During the Appointment
A filling appointment follows a predictable sequence: numbing, removing decay, placing the filling, and polishing. The numbing injection takes effect within a few minutes, and your dentist will wait until the area is fully numb before starting any drilling. Removing the decayed portion of the tooth and shaping the remaining space for the filling material is usually the longest step, especially if the cavity is deep or extends across multiple surfaces of the tooth. Once the space is clean and dry, the filling material goes in, gets shaped to match your bite, and is polished smooth.
For composite (tooth-colored) fillings, each layer is hardened with a blue UV light before the next layer is applied. This adds a bit of time compared to amalgam (silver) fillings, which are packed into the cavity in a single step. The layering process is one reason composite fillings on larger cavities can take longer than you might expect.
How Multiple Fillings Change the Timeline
If you need more than one filling, your dentist may be able to do several in a single visit, particularly when the cavities are in the same area of your mouth. Two fillings typically take 45 to 90 minutes. Three fillings run about 60 to 120 minutes. Four or more can push past two hours. When fillings are on opposite sides of the mouth, your dentist may split them across two appointments to avoid numbing your entire mouth at once.
Fillings for Kids
Pediatric fillings generally follow the same timeline. Most are completed in under an hour, and smaller cavities in baby teeth can be filled even faster since the teeth themselves are smaller and the decay is often caught early. Dentists working with children tend to keep appointments as short as possible to reduce anxiety, so they may schedule only one or two fillings per visit rather than tackling several at once.
Inlays and Onlays Take Longer
When a cavity is too large for a standard filling but doesn’t need a full crown, your dentist may recommend an inlay or onlay. These are indirect fillings, meaning they’re custom-made in a lab rather than built up inside your mouth. The process requires at least two appointments. At the first visit, your dentist removes the decay, takes an impression of the tooth, and places a temporary filling. You return for a second appointment once the permanent piece is ready, usually one to three weeks later. Each individual appointment is roughly the same length as a standard filling, but the total time commitment is significantly higher.
How Long Numbness Lasts Afterward
The filling itself may be done in under an hour, but the numbness sticks around longer. Local anesthesia used for fillings typically lasts one to two hours after the procedure, with minor residual effects lingering for three to four hours as the anesthetic gradually wears off. The exact duration depends on the type and amount of anesthetic used, and lower jaw injections tend to produce longer-lasting numbness than upper jaw injections because the nerve block is deeper.
Eating After a Filling
When you can eat depends on what type of filling you received. Composite fillings harden instantly under the UV light, so technically you can chew on them right away. In practice, most dentists recommend waiting one to three hours, not because the filling needs time to set, but because eating while your mouth is still numb makes it easy to bite your tongue, cheek, or lip without realizing it.
Amalgam fillings are different. They take about 24 hours to fully harden and reach maximum strength, so you should avoid chewing on that side for a full day. Stick to soft foods on the opposite side of your mouth during that window. Regardless of filling type, avoiding very hot or very cold foods for the first day or two can help if the tooth feels sensitive, which is common after drilling.