Patient Guide

Root Canal Treatment:
What to Expect

Root canals have a bad reputation — but the procedure itself is typically no more uncomfortable than getting a filling. This guide walks through exactly what happens, what it costs, and what recovery looks like.

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Medically reviewed by Dr. Jason Kung, DDS, MS · Specialist Endodontist · UCLA DDS · OHSU MS · May 17, 2026

Patient Education

Root canals, in 30 seconds to 3 minutes

Four short videos from the American Association of Endodontists — answering the questions patients most commonly ask before scheduling treatment.

Modern root canal treatment is not your grandfather's root canal. A 30-second look at how much has changed.Video courtesy of the American Association of Endodontists.Watch on its own page

How endodontists use advanced technology and expert training to deliver modern root canal treatment.Video courtesy of the American Association of Endodontists.Watch on its own page

Walk through the procedure step by step so you know exactly what to expect.Video courtesy of the American Association of Endodontists.Watch on its own page

Endodontists explain why claims that root canals cause disease are based on outdated theories — and why millions of root canals are completed safely each year.Video courtesy of the American Association of Endodontists.Watch on its own page

When Is a Root Canal Necessary?

A root canal becomes necessary when the soft tissue inside your tooth (the pulp, containing nerves and blood vessels) becomes infected or severely inflamed. Left untreated, the infection spreads into the bone and surrounding teeth.

What's actually inside your tooth

The hard outer enamel and the slightly softer dentin beneath it protect the pulp — the living core of nerves and blood vessels that runs from the crown of the tooth down through each root canal to the apex at the root tip.

When deep decay, a crack, or repeated dental work lets bacteria reach the pulp, the tissue becomes inflamed or infected. That's when you feel pain, sensitivity, or pressure. A root canal removes the infected tissue, cleans the entire canal system, and seals it — saving the tooth's outer structure so it can keep doing its job for decades.

Cross-section of a molar showing how untreated decay reaches the pulp, inflaming and then infecting it, with an abscess forming at the root tip. — How decay reaches the pulp: untreated decay works inward until it inflames and infects the pulp, eventually forming an abscess at the root tip.

Common signs you might need treatment

Persistent toothache, especially throbbing pain

Lingering sensitivity to heat long after the stimulus is gone

Severe sensitivity when biting or chewing

Darkening or discoloration of the tooth

Swelling or tenderness in the surrounding gum

A pimple-like bump on the gum (sinus tract / abscess)

Pain that wakes you up at night

Tooth pain following a deep cavity, crown, or filling

Sometimes a tooth that needs a root canal has no symptoms at all — it can be discovered on a routine X-ray. Only a thorough clinical exam can confirm whether treatment is needed.

The Procedure, Step by Step

Most root canals are completed in a single 60–90 minute appointment.

Diagnose
X-ray + CBCT 3D scan to map the canals before any work begins.
Numb
Profound local anesthesia. Nitrous oxide or oral sedation if you're anxious.
Clean
Remove infected pulp under the surgical microscope. Shape and disinfect every canal.
Seal
Fill the canals with biocompatible gutta-percha. Your dentist places a crown within 4–6 weeks.

In more detail

The four steps above expand into the six clinical steps Dr. Kung walks through with every patient.

Diagnosis & X-ray

Dr. Kung examines your tooth, takes digital X-rays, and often a CBCT 3D scan to map the root anatomy and confirm the diagnosis. This usually takes 20–30 minutes.

Local Anesthesia

The area is numbed thoroughly before any work begins. Most patients are surprised by how comfortable this is — modern anesthesia makes root canals far less painful than their reputation suggests. We confirm full numbness with a cold test before starting; if you're not fully numb, we wait or supplement.

Read: Will my root canal hurt? — A specialist's honest answer

Pulp Removal

Under the Zeiss OPMI operating microscope, Dr. Kung accesses the inner pulp chamber, removes the infected or inflamed tissue, and cleans each canal to its full length.

Shaping & Disinfection

The canals are shaped with precision files and irrigated with antimicrobial solution to eliminate bacteria. This step is where specialist microscope use makes the biggest difference in outcome.

Sealing

The cleaned canals are filled with a biocompatible material called gutta-percha and sealed. A temporary or permanent filling is placed on top.

Crown (by your dentist)

Within 4–6 weeks, you'll return to your regular dentist for a crown to protect and restore the tooth. Dr. Kung sends a full treatment report so your dentist is fully informed.

Cross-section of a tooth after root canal treatment, with the cleaned canals filled with gutta-percha, a core build-up restoring the crown, and the surrounding bone healed. — After treatment: the cleaned canals are sealed with gutta-percha and restored with a core build-up, allowing the surrounding bone to heal.

Over 95%

Reported success rate for endodontic treatment in published clinical literature.

15M+

Root canals performed each year in the U.S. — saving natural teeth.

2–3 yrs

Of additional specialty residency endodontists complete beyond dental school.

Sources: American Association of Endodontists (AAE).

Recovery & What to Expect

During the procedure

You'll be fully numb. Many patients describe the experience as similar to a filling — pressure and vibration, but no sharp pain. A small number of patients with severe infections need a second dose of anesthetic; Dr. Kung is patient and will ensure you're fully comfortable before proceeding.

Immediately after

The area will be numb for a few hours. Some patients return to work the same afternoon. Avoid chewing on the treated tooth until your permanent crown is placed.

Days 1–3

Mild soreness is common as the tissue settles. Over-the-counter ibuprofen (Advil) handles this well for most patients. About 85% of patients report feeling better than before the procedure within 24 hours.

Long-term

A root canal-treated tooth with a proper crown can last a lifetime. The key is getting your crown placed promptly (within 4–6 weeks) — an unrestored treated tooth is vulnerable to fracture.

Root Canal or Extraction — Which Is Better?

When given the choice, saving your natural tooth is almost always the better option. Extractions may seem simpler or cheaper upfront, but replacing a missing tooth with an implant or bridge typically costs more and takes longer than a root canal plus crown.

Root Canal + Crown

Saves your natural tooth
Preserves jaw bone
No gap in your smile
Typically one to two appointments
Crown may last decades with proper care

Extraction + Implant

Removes the problem tooth entirely
Implant required to fill the gap
Higher total cost in most cases
Multiple appointments over months
Bone graft sometimes required

Root canal treatment vs extraction-and-implant: side-by-side comparison of cost, recovery, success rate, and long-term outcomes.
Factor	Root Canal + Crown	Extraction + Implant
Total time to completion	1–2 visits over 1–3 weeks (crown placed at the general dentist after).	3–9 months — extraction, bone graft healing, implant placement, osseointegration, then crown.
Typical out-of-pocket (Sunnyvale, 2026)	$1,400–$2,400 (root canal) + $1,200–$1,800 (crown) ≈ $2,600–$4,200.	$4,500–$7,500 (implant + abutment + crown), plus $400–$1,500 if a bone graft is needed.
Long-term success (10+ years)	~90% retention; well-restored teeth routinely last decades.	~93–95% survival, but peri-implantitis and bone loss are not always counted as "failure."
Preserves natural tooth?	Yes — your natural root, ligament, and proprioception remain.	No — natural tooth is removed; some bone resorption is unavoidable.
Recovery	Mild soreness 2–4 days; most patients return to work the same day.	3–7 days after extraction; additional recovery after implant surgery.
Bite feel	Identical to a natural tooth — periodontal ligament still senses pressure.	Slightly different — implants are ankylosed to bone, no ligament feedback.
When it's the better choice	Restorable tooth structure, no vertical root fracture, adequate periodontal support.	Tooth is non-restorable, vertically fractured, or has severe periodontal bone loss.

Cost ranges reflect typical Bay Area fees as of 2026. Insurance reimbursement varies — request a written pre-treatment estimate before scheduling.

Frequently Asked Questions

How much does a root canal cost?

Cost varies by tooth and number of canals — front teeth (1 canal) are less than molars (3–4 canals). With PPO insurance, out-of-pocket cost is often $200–$600. Without insurance, treatment typically ranges from $900–$1,500. We provide a full estimate before starting and will verify your insurance benefits.

How long does a root canal take?

Most root canals are completed in 60–90 minutes in a single visit. Complex cases or retreatments may require a second appointment.

Can I drive myself home afterward?

Yes — root canals are done under local anesthesia only, not general sedation. You'll be numb for a few hours but can drive, work, and go about your day.

Why go to a specialist instead of my regular dentist?

Endodontists complete two additional years of specialty training exclusively focused on root canals and dental pulp. Dr. Kung also uses the Zeiss OPMI surgical microscope — most general dentists don't have one. For complex cases (calcified canals, curved roots, retreatments), specialist care significantly improves outcomes.

What if the root canal fails?

The success rate for root canal treatment is around 85–97%. If a treated tooth develops problems later, retreatment or endodontic surgery (apicoectomy) can often save it. Dr. Kung handles both retreatment and microsurgery.

Our Sunnyvale office

Where you'll be treated

Calm, modern, and built around the equipment that lets us see what general dentists usually can't — the Carl Zeiss surgical microscope and the J. Morita CBCT 3D scanner.

Reception and waiting area at Silicon Valley Endodontics and Microsurgery in Sunnyvale, with backlit signage and contemporary seating. — Reception — Suite 106

Carl Zeiss OPMI surgical microscope used for root canal treatment at Silicon Valley Endodontics. — Carl Zeiss OPMI surgical microscope

Root canal treatment — serving 30+ Bay Area cities

Dr. Jason Kung provides root canal treatment to patients across Silicon Valley from our Sunnyvale office. Evening and weekend hours, same-day emergencies, free on-site parking.

Sunnyvale Cupertino Mountain View Palo Alto Santa Clara San José Los Altos Campbell Milpitas Fremont + 23 more cities

Questions? We're Happy to Help.

Call us or send a message — we'll answer your questions and get you scheduled, often same week.

Request an Appointment (669) 234-2354

Mon–Fri 8am–7pm · Sat–Sun 9am–3pm