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How Long Does It Take to Fill a Cavity?

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Smiling woman as a dentist examines her teeth for cavities with dental instruments in a clinic setting.

A cavity filling might not be your idea of fun, but it doesn’t have to be a stressful experience. Knowing what to expect during a cavity filling can help ease uncertainty and help you feel more prepared. 

Whether you’re dealing with your first cavity or you’ve had a filling before, many people wonder how long the appointment actually takes. The short answer? It depends. 

Factors like the size of your cavity, the tooth’s location, and the type of filling material used all play a role in how long filling a cavity takes. In general, a simple filling can take as little as 20 minutes or up to an hour. But there’s more to it than just time on the clock.

What Is a Cavity?

A cavity is an area of decay in your tooth caused by acid-producing bacteria. Over time, plaque builds up on your teeth and feeds on the sugars found in food and drinks. The byproduct of this process is acid, which gradually wears down the outer enamel and eventually creates a small hole or “cavity.”

If left untreated, cavities can lead to pain, infection, or even tooth loss. That’s why it’s important to catch them early and treat them before decay spreads further.

How Cavities Affect Your Oral Health

Cavities may start small, but they can quickly become more serious if ignored. As decay moves past the enamel and into deeper parts of the tooth, such as the dentin or pulp, treatment becomes more complicated. At that point, you might need a root canal or even an extraction.

Addressing cavities in their early stages helps protect your tooth structure, minimizes discomfort, and avoids more involved procedures down the road.

Signs You Might Have a Cavity

Not all cavities are obvious at first, but here are some signs that could indicate tooth decay:

  • Sensitivity to hot, cold, or sweet foods and drinks
  • Pain when chewing or biting down
  • Visible pits or holes in your teeth.
  • Discolouration (white, brown, or black spots)
  • Bad breath or a lingering unpleasant taste
  • Sharp, sudden toothaches

Some of these symptoms can also indicate other oral health issues, so it’s best to see your dentist for a professional diagnosis.

What Affects How Long a Filling Takes?

While a standard cavity filling is usually completed in 30 to 60 minutes, several factors can influence how long your appointment might last:

  • Size and depth of the cavity: Small surface-level decay requires less preparation and less filling material.
  • Location of the tooth: Molars at the back of the mouth can be harder to reach and take longer to treat.
  • Type of filling material: Composite fillings take more time to layer and cure than traditional amalgam.
  • Dentist’s technique and tools: Different technologies and methods can streamline treatment while still maintaining your comfort and precision.

What to Expect During Your Appointment

Here’s a breakdown of the typical steps in a cavity-filling procedure:

  • Numbing (10–20 minutes): We’ll begin by applying a local anesthetic to keep you comfortable. A rubber dam may be used to isolate the tooth.
  • Decay removal (5–20 minutes): Using specialized tools, we carefully remove the decayed portion of your tooth.
  • Filling (5–20 minutes): Once the area is clean, we will fill the cavity using your chosen material.
  • Shaping and bite check (5–10 minutes): We shape, polish, and adjust the filling to feel natural when you bite down.
Patient wearing protective orange glasses during a dental filling procedure as a curing light is used to harden the composite material inside the mouth.

For small cavities, the whole process might be done in half an hour. For deeper cavities or multiple fillings, plan for a bit more time.

When Do You Need a Filling?

Cavities don’t go away on their own. If we spot early signs of decay or if you’ve been experiencing symptoms, a filling can prevent further damage. The sooner issues are addressed, the less complex (and shorter) the treatment typically is.

Tips to Prevent Cavities

Want to avoid future fillings? These tips can help protect your smile:

  • Brush with fluoride toothpaste at least twice a day
  • Floss daily to remove plaque between teeth
  • Limit sugary and acidic snacks and drinks
  • Visit your dentist regularly for exams and cleanings
  • Consider dental sealants or fluoride treatments if recommended

What to Do If You’re Nervous About Getting a Filling

Feeling anxious before a dental procedure is normal, especially if it’s your first filling. At Shin Dentistry, we’re here to support you every step of the way. We take time to explain the process, answer your questions, and keep your comfort a priority throughout your visit.

If you’re worried about pain, we can walk you through the numbing process and reassure you about what to expect. The goal is to help you feel calm and cared for from the moment you sit down to the moment you leave with a healthier tooth.

Cavity Treatment That Fits Your Schedule

A cavity filling doesn’t have to be complicated or time-consuming. With modern techniques, many fillings can be completed in under an hour.If you’ve been putting off treatment or you’ve started to notice signs of tooth decay, we’re here to help. Book a visit with us at Shin Dentistry in Stouffville to take care of your cavity before it becomes a bigger issue. Your smile deserves lasting care.

Written by Dr. Charles Shin

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