Plain-English answers to the questions Bay Area patients ask most — about root canals, cost, insurance, pain, and when to see a specialist. Answered by Dr. Jason Kung, a Specialist Endodontist who has performed over 10,000 root canals in Sunnyvale.
Modern root canal treatment is essentially painless. We use profound local anesthesia — the same nerve blocks oral surgeons use — and most patients say the procedure feels no different than getting a filling. Many patients fall asleep during the appointment. The lingering myth that root canals are painful comes from procedures performed before modern anesthesia, ultrasonic instruments, and surgical microscopes were standard.
How we keep you comfortable →When a tooth is acutely inflamed (irreversible pulpitis), standard nerve blocks sometimes need supplementation. We routinely use intraosseous and intraligamentary anesthesia, which deliver anesthetic directly to the bone next to the tooth. This achieves profound numbness even on the hottest teeth. We don't start treatment until you confirm you cannot feel anything.
Yes. We offer nitrous oxide (laughing gas) for patients who want light relaxation while staying awake, and oral sedation (a single pill taken before the appointment) for patients who need deeper relaxation. We do not offer IV sedation. Call (669) 234-2354 to discuss sedation options before your appointment.
Most patients have mild tenderness when biting for 2–4 days that's easily managed with ibuprofen and acetaminophen. About 5% have moderate soreness that lasts up to a week. Severe pain after a root canal is uncommon and means you should call us — we hold same-day post-op slots every day.
Post-op instructions →In the South Bay, specialist root canal fees typically run $1,400–$1,900 for a front tooth, $1,600–$2,100 for a premolar, and $1,800–$2,400 for a molar. Retreatment of a previous root canal and apicoectomy (microsurgery) are higher. We give every patient a clear written estimate before any treatment is scheduled — no surprises.
Detailed cost breakdown →We are out-of-network with all PPOs. That said, most PPO plans pay 50–80% of the specialist fee for endodontic treatment whether the provider is in- or out-of-network. We file the claim for you and apply the insurance payment directly to your balance. You pay the difference, and we tell you the expected amount in writing before treatment starts.
Insurance & billing →Yes. We accept CareCredit (with 6- and 12-month no-interest options for qualified patients), HSA/FSA cards, and all major credit cards. For patients without insurance, we offer a courtesy discount when treatment is paid in full at the time of service.
Endodontists complete an additional 2–3 years of full-time graduate residency after dental school, performing thousands of root canals under faculty supervision. Specialist offices are also outfitted differently — every operatory has a Zeiss surgical operating microscope ($60–80k each), CBCT 3D imaging, and ultrasonic instrumentation. The higher fee reflects training, equipment, and the higher predictability of a specialist outcome.
An endodontist is a dentist who completed an additional accredited 2-year graduate residency focused exclusively on the dental pulp, root canal system, and surrounding tissues. Dr. Kung earned his DDS from UCLA and his MS in Endodontics from Oregon Health & Science University (OHSU). About 3% of dentists in the U.S. are endodontic specialists.
What is an endodontist →General dentists refer to endodontists when a case needs specialized equipment (surgical microscope, CBCT 3D imaging), advanced anatomy (calcified canals, MB2, S-shaped roots), retreatment of a previous root canal, or apical microsurgery. The American Association of Endodontists' Case Difficulty Assessment Form (CDAF) helps general dentists decide which cases benefit from a specialist.
Case difficulty assessment →Yes. No referral is required to schedule with us. Many patients come directly because they want a specialist to evaluate cracked-tooth pain, persistent pain after a previous root canal, or a save-the-tooth second opinion before agreeing to an extraction.
When a tooth can be saved, a root canal is almost always the better long-term choice. The literature shows endodontically treated teeth have 5- and 10-year survival rates comparable to single-tooth implants — but you keep your own tooth, your own ligament, your own nerve sensation, and you avoid surgery, bone grafting, and an artificial crown abutment. We're happy to give a save-the-tooth second opinion before you commit to extraction.
Get a second opinion →It depends on how deep the crack extends. A crack confined to enamel needs only a crown; a crack that reaches the pulp needs root canal treatment plus a crown; a crack that splits the root means the tooth must be extracted. We use the surgical microscope and CBCT to map the crack precisely before recommending treatment. Cracked-tooth diagnosis is one of the most common reasons general dentists refer patients to us.
Cracked tooth diagnosis →Time matters. Pick the tooth up by the crown (not the root), gently rinse with milk or saline if dirty, and either replant it into the socket immediately or store it in cold milk. Then call us at (669) 234-2354 — we hold same-day emergency slots. Re-implantation within 30 minutes gives the best long-term prognosis.
Dental trauma first aid →Persistent or returning pain after a root canal usually means one of three things: (1) a missed canal that wasn't cleaned originally, (2) a fracture, or (3) a new cavity that re-entered the pulp space. We use CBCT 3D imaging and the operating microscope to figure out which it is and whether retreatment, apicoectomy (microsurgery), or extraction is the right next step.
Root canal retreatment →A 2024 systematic review in the Journal of Endodontics (Sabeti et al.) pooled 29 contemporary studies of nonsurgical retreatment and reported periapical healing rates of 78.8% (strict criteria) to 87.5% (loose criteria), and overall success of 78.0% to 86.4%. Outcomes are significantly better when the preoperative lesion is small or absent, when the new root filling reaches within 0–2 mm of the apex, and with longer follow-up. In short: when a specialist redoes a failed root canal with modern tools, roughly four out of five teeth are completely healed and closer to six out of seven are clearly on the way at follow-up.
Read the full 2024 evidence breakdown →Apicoectomy (also called endodontic microsurgery) is a small surgical procedure where the tip of the root and any infected tissue around it are removed through a tiny opening in the gum. We perform every apicoectomy under the surgical operating microscope at 8–25x magnification, using ultrasonic retro-preparation and bioceramic root-end fillings — the modern standard that gives 90%+ success rates.
Apicoectomy →Many tooth-pain cases turn out to be non-endodontic in origin — TMJ disorders, atypical facial pain, sinusitis referring to upper molars, neuropathic pain, or referred muscle pain. We use a structured diagnostic protocol (cold testing, percussion, palpation, CBCT, and selective anesthesia) to determine whether the pain is actually coming from a tooth before recommending any irreversible treatment.
When it isn't a tooth →Resorption is when your body's own cells start dissolving the tooth structure from the inside (internal resorption) or outside (external resorption). It's painless until late stages, so it's usually caught on a routine X-ray. Some types are stable and need only monitoring; others progress quickly and need treatment within months. CBCT 3D imaging is essential to map resorption accurately.
Tooth resorption →1565 Hollenbeck Avenue, Suite 106, Sunnyvale, CA 94087 — just south of El Camino Real, with free on-site parking. About 8 minutes from Cupertino, 10 minutes from Mountain View, 12 minutes from Santa Clara, and 15 minutes from Palo Alto.
Monday through Friday: 8:00 am to 7:00 pm. Saturday and Sunday: 9:00 am to 3:00 pm. We hold same-day emergency slots every day for severe pain or dental trauma. Call (669) 234-2354.
Yes. Mandarin (普通话) is spoken in our office. Our website is fully translated into 8 languages: English, Spanish (español), Mandarin (中文), Traditional Chinese (繁體中文), Korean (한국어), Vietnamese (tiếng Việt), Hindi (हिन्दी), and Persian/Farsi (فارسی). We see patients from across Silicon Valley's diverse communities.
Every operatory has a Zeiss OPMI surgical operating microscope used at 4–25× magnification on every case. We use J. Morita CBCT 3D imaging on-site (no need to send you to an imaging center), Sirona digital radiography with paperless charts, ultrasonic instrumentation, bioceramic sealers, and rubber dam isolation on every root canal.
Our technology →Yes. We have 193+ verified reviews averaging 4.9★ on Google, Yelp, and Healthgrades. We never solicit fake reviews and we never gate honest feedback. After every visit, you'll receive a single follow-up text inviting you to share your experience — public or private, your choice.
About 10–11 years after high school: 4 years undergraduate (some combined BS/DDS tracks compress this to 6–7), 4 years dental school (DDS or DMD — functionally equivalent degrees), and 2–3 years of CODA-accredited endodontic residency. Most endodontists begin practicing at age 28–30. There is no legal shortcut in California — only graduates of a CODA-accredited residency may call themselves a 'Specialist Endodontist.'
Full career guide →Whatever major you can earn the highest GPA in, with pre-dental science requirements completed alongside. Dental schools care about your science GPA (target 3.6+), overall GPA, DAT score, shadow hours, and personal statement — they do not weight major difficulty meaningfully. Biology and biochemistry are common because the science overlap is convenient. Humanities and engineering majors with completed pre-reqs are admitted every year and sometimes have an advantage as rarer applicants.
Very. The Dental Admission Test (perceptual ability, quantitative reasoning, reading comprehension, natural sciences) is a major component of your application alongside GPA. National mean is around 20–21 out of 30; top-tier dental schools cluster around 23+. Plan 3–4 months of dedicated preparation and aim to take it once — multiple attempts are visible to admissions committees.
It's a strong fit if you enjoy fine-detail microscopic work, find pulp diagnosis interesting, like procedures with immediate outcomes (severe pain → no pain in 90 minutes), and don't mind one-and-done patient relationships. It's a poor fit if you'd rather build long-term patient relationships, do more varied procedures, or work with a wide age range. Talk to multiple practicing specialists honestly before committing to two more years of residency.
Full career guide →Board certification (Diplomate of the American Board of Endodontics) is an additional voluntary credential approximately 25% of US specialist endodontists hold. It involves a written exam, oral exam, and case-portfolio defense after residency. In California, the legal title 'Specialist Endodontist' is conferred by completing a CODA-accredited residency, not by board certification — they have the same legal scope of practice. It's professional misconduct in California to call yourself 'board certified' without holding the Diplomate.
Yes. Dr. Kung hosts a small number of pre-dental and dental students each year for a half-day or full-day in the practice — observing live cases, the operating microscope, and CBCT in use. No cost. Details and the email template are on the For Students page. Most years he can also accommodate a small number of high school students who've had prior healthcare exposure; mention that in your inquiry.
For Students — shadowing inquiries →Total educational debt for a US-trained specialist endodontist (undergrad + dental school + residency) typically ranges $400,000–$700,000 depending on undergraduate cost, dental school choice (private vs public, in-state vs out-of-state), and whether the residency pays a stipend or charges tuition. The American Dental Education Association (ADEA) publishes current debt averages annually — consult their data before making major school choices.
The oldest documented evidence of an invasive dental treatment is a 59,000-year-old Neanderthal molar (specimen Chagyrskaya 64) from Chagyrskaya Cave in southwestern Siberia, described in PLOS ONE in May 2026 (Zubova et al., DOI 10.1371/journal.pone.0347662). The tooth shows a deliberately drilled access cavity into the dental pulp chamber, confirmed by micro-CT, scanning electron microscopy of stone-tool wear patterns, and experimental replication. Chewing wear on the rim of the access cavity indicates the Neanderthal survived the procedure. The authors describe it as the earliest known therapeutic intervention beyond palliative care — roughly 30,000 years before modern humans reached the region.
Read Dr. Kung's full breakdown →Some did. Beyond the 59,000-year-old Neanderthal case, the archaeological record includes drilled teeth from Mehrgarh, Pakistan (~7,500–9,000 years before present), a beeswax dental filling on a 6,500-year-old human jaw from Slovenia, and various intentionally modified teeth across early agricultural societies. None of these are root canals in the modern sense — sealing the canal with an inert filling material to prevent reinfection is a development of the last roughly 150 years — but they show that the basic judgment 'this tooth is worth saving' is much older than dentistry as a profession.
Materially better. Three changes drive the difference: surgical operating microscopes at 4–25× magnification (standard since the 2000s) let the endodontist actually see canal anatomy that was previously felt rather than seen; CBCT 3D imaging (standard since the 2010s for complex cases) reveals canals, fractures, and bone defects that 2D X-rays cannot show; and nickel-titanium rotary instrumentation combined with ultrasonically-activated sodium hypochlorite irrigation disinfects the canal system far more thoroughly than the stainless-steel hand files and saline rinses of earlier decades. The current published 10-year survival rate for root-canal-treated teeth managed by specialist endodontists is in the 92–98% range, depending on the case complexity.
Modern root canal in 2026 →Each question below has its own page with a detailed answer from Dr. Kung.
Endodontists complete 2–3 extra years of residency and equip operatories with a surgical microscope, CBCT, and ultrasonics — raising molar success to 90–97%.
Read full answerAn acutely inflamed tooth can resist standard nerve blocks, so endodontists add intraosseous anesthesia to numb even the most painful teeth before we begin.
Read full answerYes. We accept CareCredit (6- and 12-month no-interest financing), HSA/FSA, and major credit cards, plus a discount for paying in full — written estimate first.
Read full answerCall us at (669) 234-2354 or send a question through our contact form. Dr. Kung personally reviews every patient inquiry.
