The words “root canal” often make people anxious, but the reality is that modern root canal treatment is designed to relieve pain—not cause it. Unfortunately, many patients delay treatment because they hope the discomfort will simply go away. In many cases, that delay allows an infected tooth to worsen, increasing the risk of abscess formation, bone loss, or even tooth extraction.

Recognizing the early warning signs of a tooth that may need root canal therapy can help save your natural tooth while relieving pain and preventing more serious complications.

At her Henderson, Nevada practice, Marielaina Perrone, DDS, believes early diagnosis and conservative treatment are the keys to preserving healthy smiles whenever possible.

What Is a Root Canal?

Inside every tooth is a soft tissue called the dental pulp.

The pulp contains:

• Blood vessels
• Nerves
• Connective tissue

When bacteria enter the pulp through deep decay, cracks, trauma, or leaking fillings, inflammation and infection can develop. Because the pulp is enclosed inside the tooth, pressure builds quickly, often causing significant pain.

Root canal therapy removes the infected tissue, disinfects the inside of the tooth, and seals it to prevent reinfection—allowing you to keep your natural tooth.

Dr. Perrone’s Perspective

“One of the biggest misconceptions in dentistry is that root canals are painful. In reality, it’s the infection that’s causing the pain. Root canal therapy removes that infection, relieves discomfort, and often saves a tooth that would otherwise be lost.”

— Marielaina Perrone, DDS

1. Persistent Tooth Pain

Ongoing tooth pain is one of the most common signs that the pulp may be inflamed or infected.

Pain may:

• Come and go
• Be constant
• Wake you at night
• Worsen while chewing
• Radiate into the jaw, ear, or temple

Persistent pain should never be ignored.

2. Lingering Sensitivity to Hot or Cold

It’s normal for teeth to briefly react to cold drinks.

However, if sensitivity lingers for:

• Several seconds
• Minutes
• Long after the temperature is gone

the nerve inside the tooth may already be damaged.

This is one of the classic signs of irreversible pulp inflammation.

3. Pain When Biting

If biting down causes sharp discomfort, the tooth may have:

• Pulp inflammation
• A cracked tooth
• Infection near the root
• Inflammation of the ligament supporting the tooth

Early evaluation is important before the damage progresses.

4. Swollen Gums

Localized swelling around one tooth often indicates infection.

You may notice:

• Puffy gums
• Tenderness
• A small bump near the tooth
• Gum irritation

These symptoms should be evaluated promptly.

5. A Pimple on the Gum

A recurring pimple-like bump on the gums is called a draining fistula.

It often allows infection to drain from an abscessed tooth.

Although the drainage may temporarily reduce pain, the infection remains and still requires treatment.

6. Tooth Discoloration

A tooth that suddenly becomes:

• Gray
• Dark yellow
• Brown
• Darker than neighboring teeth

may have suffered internal nerve damage.

Trauma is a common cause of this type of discoloration.

7. Facial Swelling

Significant swelling of the face or jaw may indicate a spreading dental infection.

This can become a serious medical condition if left untreated.

Facial swelling accompanied by:

• Fever
• Difficulty swallowing
• Difficulty breathing

requires immediate emergency evaluation.

8. A Deep Cavity

Not every cavity requires a root canal.

However, when decay reaches the pulp, bacteria can infect the nerve.

Routine dental examinations allow cavities to be treated before they become large enough to require root canal therapy.

9. A Cracked Tooth

Even small cracks can allow bacteria to reach the pulp.

Common causes include:

• Teeth grinding
• Chewing ice
• Trauma
• Large fillings
• Biting hard foods

Prompt treatment often prevents worsening infection.

10. Previous Dental Trauma

A tooth may require a root canal months—or even years—after an injury.

Even if no pain occurs immediately following trauma, the pulp may gradually lose its blood supply and become non-vital.

Any tooth that has experienced significant injury should be monitored regularly.

What Happens During a Root Canal?

Modern root canal treatment is typically completed under local anesthesia and is similar in comfort to receiving a dental filling.

Treatment usually involves:

1. Numbing the tooth
2. Removing infected pulp
3. Cleaning and disinfecting the root canals
4. Sealing the canals
5. Restoring the tooth with a filling or crown

Most patients experience immediate relief once the infected tissue is removed.

Can Every Tooth Be Saved?

Not always.

A tooth may not be restorable if there is:

• Severe fracture
• Extensive bone loss
• Advanced periodontal disease
• Insufficient remaining tooth structure

When possible, however, preserving your natural tooth is almost always the preferred option.

What Happens If You Delay Treatment?

Ignoring an infected tooth can lead to:

• Worsening pain
• Dental abscess
• Bone destruction
• Swelling
• Tooth loss
• Spread of infection into surrounding tissues

Early treatment is generally simpler, less expensive, and more predictable.

How to Reduce Your Risk of Root Canal Treatment

Preventive care remains your best defense.

Protect your teeth by:

• Brushing twice daily
• Flossing every day
• Wearing a nightguard if you grind your teeth
• Visiting your dentist every six months
• Treating cavities early
• Avoiding chewing ice and hard objects

Healthy habits help prevent infections before they start.

Frequently Asked Questions

Does a root canal hurt?

Modern root canal therapy is performed using local anesthesia and is generally no more uncomfortable than having a filling placed. The procedure relieves pain caused by infection.

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How do I know if I need a root canal?

Persistent tooth pain, prolonged hot or cold sensitivity, swelling, pain when biting, discoloration, or an abscess may indicate that root canal treatment is needed. A dental examination and X-rays provide the diagnosis.

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Can antibiotics replace a root canal?

No. Antibiotics may temporarily reduce swelling but cannot eliminate infection inside the tooth. The infected pulp must be removed.

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Will I need a crown afterward?

Many back teeth require a crown after root canal therapy to restore strength and reduce the risk of fracture.

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Is it better to save a tooth or remove it?

Whenever possible, preserving your natural tooth is generally the healthiest long-term option.

Don’t Ignore the Warning Signs

Tooth pain is your body’s way of telling you something isn’t right.

Early diagnosis often means simpler treatment, less discomfort, and a much better chance of saving your natural tooth.

If you’re experiencing persistent tooth pain, swelling, or sensitivity, schedule an evaluation with Marielaina Perrone, DDS. Prompt treatment can relieve your discomfort, eliminate infection, and help preserve your smile for years to come.

About the Author

Marielaina Perrone, DDS is an award-winning cosmetic, restorative, and implant dentist serving Henderson, Green Valley, Anthem, Seven Hills, Inspirada, Las Vegas, and surrounding Southern Nevada communities. A graduate of Stony Brook University School of Dental Medicine, she has over 25 years of experience providing comprehensive restorative dentistry, root canal therapy, emergency dental care, and preventive dentistry with a gentle, patient-centered approach.

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Medically Reviewed By

Marielaina Perrone, DDS
Doctor of Dental Surgery
General, Restorative & Cosmetic Dentist – Henderson, Nevada

Dr. Perrone regularly completes advanced continuing education in restorative dentistry, endodontic diagnosis, emergency dental treatment, dental trauma, and evidence-based patient care to help preserve natural teeth whenever possible.

Updated: July 2026