Root Canals
A modern root canal stops the pain and saves your natural tooth, and it is far gentler than its reputation, at our Fremont, Cupertino, and Milpitas offices.
The procedure that saves a tooth
Inside every tooth is a soft tissue called the pulp, a small bundle of nerves and blood vessels running through the center of the tooth and down into each root. When decay reaches the pulp, or an injury exposes it, the tissue becomes inflamed and infected. The pain can be severe, and left untreated the infection spreads into the surrounding bone.
A root canal removes the infected pulp, cleans and shapes the canals inside the roots, and seals the tooth from the inside. It is the only treatment that keeps the natural tooth in these situations. The alternative is extraction, followed by an implant or bridge to fill the gap. The American Association of Endodontists describes it as an often straightforward procedure to relieve pain and save teeth, and a treated tooth can last a lifetime with proper care.
For patients across Fremont, Cupertino, Milpitas, and the wider Bay Area, it is one of the most common procedures we perform, and almost always preferable to losing the tooth.
When a tooth is asking for help
Most root canals are not the result of one big event. They follow decay or trauma that reached the pulp without earlier treatment, and the classic signs build over days or weeks. If you notice any of them, do not wait. Early treatment is faster, simpler, and almost always less expensive than waiting until the pain becomes unbearable.
Symptoms worth a call
- Severe, lingering tooth pain, especially when biting or applying pressure.
- Hot or cold sensitivity that lasts more than a few seconds after the trigger is gone.
- A tooth darkening from the inside.
- Swollen or tender gums around one specific tooth.
- A small pimple-like bump on the gum, which is infection finding a way to drain.
- A deep crack or chip that exposes the inner tooth.
What a root canal involves
A root canal typically takes 60 to 90 minutes for a front tooth and up to two hours for a molar, which has more roots to treat. Most are completed in a single visit; larger or more complex teeth sometimes need two. You are fully numb from the start, and the procedure itself feels much like having a filling placed. If dental visits make you anxious, ask about our comfort options when you book.
Numb and isolate. Local anesthetic first, then a small rubber sheet called a dental dam isolates the tooth to keep it clean and dry throughout.
Access and clean. A small opening is made in the top of the tooth. The infected pulp is removed and each canal is gently cleaned and shaped.
Disinfect and fill. The canals are flushed with an antimicrobial solution, then filled and sealed with a biocompatible material called gutta-percha.
Restore the tooth. The access opening is closed with a filling. Most back teeth then need a crown to protect the tooth from cracking.
A modern root canal feels a lot more like getting a filling than like the procedure in the cartoons. Patients almost always tell us afterward that the dread was worse than the appointment.
Root canals: reputation vs. reality
Root canals carry a reputation that has not kept up with modern dentistry. Decades ago the procedure was hard on patients. Anesthetics, instruments, and techniques have all improved dramatically since, and the AAE's own myths page addresses each of the common fears in turn. Here is what is actually true today.
- "They're incredibly painful." The pain is what brings you in. The procedure relieves it. With modern anesthetic, most patients say it feels similar to a filling.
- "It takes forever." Most are done in a single 60 to 90 minute visit. Molars sometimes take two.
- "The tooth is dead afterward." The pulp is gone, but the tooth structure stays and works normally. Treated teeth can last a lifetime.
- "Pulling it would be easier." Extraction creates a new problem: bone loss, shifting teeth, and the need for an implant or bridge.
- "They make you sick." There is no credible evidence linking root canals to systemic illness. The procedure has been performed safely millions of times.
Healing and long-term care
Most patients are back to normal activity the next day. The tooth may be tender for a few days while the surrounding tissue heals, but the deep pain you came in with is typically gone right away.
The first few days
- Mild soreness is normal for two to three days. Over-the-counter pain relievers usually handle it.
- Chew on the other side until the permanent crown is placed, if one is needed.
- Avoid very hard or sticky foods on the treated tooth.
- Brush and floss as usual, gently around the area.
- Call us if pain worsens or has not improved after three to four days.
Long term
- Get the crown placed promptly on back teeth, usually within a few weeks of the root canal.
- Keep your routine cleanings and exams. We check the treated tooth at every visit.
- Do not use the tooth as a tool. No ice, pen caps, or hard candy.
- Wear a night guard if you grind. Treated teeth are more prone to cracking under heavy force.
Root canal vs. extraction
When a tooth is badly infected there are two choices: save it with a root canal, or take it out and replace it later. Both work, but they are very different paths.
Extraction is faster and cheaper up front, but it does not end there. A missing tooth lets the neighbors drift and the jawbone underneath begins to shrink within months. To restore function you will eventually need an implant or bridge, each of which costs more than the root canal would have and takes several more visits. The AAE lays out the comparison in detail.
That is why we recommend saving the natural tooth whenever it can be saved. A root canal preserves bone, function, and the surrounding teeth, and a properly restored tooth can last for decades. Extraction makes sense only when the tooth is too damaged to keep, and your doctor will tell you plainly if that is the case.
Root canals, answered
Does a root canal hurt?
Not during the procedure. You are fully numb throughout, and most patients describe it as no more uncomfortable than a filling. The pain people associate with root canals usually comes from the infection that brought them in, which the procedure relieves. Mild soreness for a day or two afterward is normal and handled with over-the-counter pain relievers.
How long does a root canal take?
Most are completed in a single 60 to 90 minute visit. Front teeth are quicker because they have one or two roots. Molars take longer because they can have three or four. Complex cases may need two appointments about a week apart.
Will I need a crown afterward?
For molars and premolars, almost always. These teeth take heavy chewing force and become more brittle once the inside has been cleaned out, so a crown protects them from cracking. Front teeth can sometimes do without one, depending on how much natural tooth remains. Your doctor will tell you before treatment starts.
How much does a root canal cost?
It depends on which tooth is treated, since molars take more time than front teeth, and on whether a crown is needed afterward. We check your plan and give you a written estimate covering both the root canal and any follow-up crown before scheduling.
How long will a treated tooth last?
A treated tooth can last a lifetime. Long-term success depends on getting the crown placed promptly where one is needed, keeping up routine exams, and protecting the tooth from grinding.
What happens if I put it off?
The infection will not clear on its own. It spreads into the surrounding jawbone, the pain gets worse, and an abscess usually follows. Eventually the tooth has to be extracted, and severe infections can become medical emergencies. Treating it now is always simpler and less expensive than waiting.
Are root canals safe?
Yes. Despite claims that circulate online, there is no credible evidence linking root canal treatment to illness elsewhere in the body. The American Association of Endodontists addresses these claims directly, and the procedure has been performed safely millions of times over many decades.