Endodontic Diagnosis — Houston, TX
How a Tooth Is Diagnosed for Root Canal
Determining whether a tooth needs root canal therapy requires more than a single X-ray. Dr. Kevin Nail uses a systematic, multi-test diagnostic protocol — combining clinical tests, advanced 3D imaging, and AI-assisted analysis — to reach an accurate diagnosis before any treatment begins.
Step One
Signs & Symptoms That Prompt Evaluation
The diagnostic process begins with what you're experiencing. Each symptom provides a clinical clue about the condition of the pulp tissue inside your tooth.
Spontaneous toothache or throbbing pain
Suggests irreversible pulpitis or pulp necrosis — the nerve is under pressure or has died.
Lingering sensitivity to cold (>5 seconds)
Classic sign of irreversible pulpitis. The inflamed pulp cannot return to normal.
Sensitivity to heat
Heat sensitivity — especially when cold relieves it — is a strong indicator of pulp necrosis with gas formation inside the canal.
Pain on biting or chewing
Indicates periapical inflammation — the infection has spread to the ligament around the root tip.
Swelling of the gum or face
Abscess formation. The infection has spread beyond the root and is forming a pocket of pus in the surrounding tissue.
Pimple or bump on the gum (sinus tract)
A fistula draining from a periapical abscess. The body is creating an escape route for the infection.
Tooth darkening or discoloration
Breakdown of blood cells inside a necrotic pulp stains the dentin from the inside out.
No symptoms at all
A necrotic (dead) pulp often causes no pain. The tooth may appear healthy but harbor a chronic infection visible only on X-ray or CBCT.
Important: No symptoms does not mean no problem.
A necrotic (dead) pulp frequently causes no pain at all. Chronic infections can silently destroy surrounding bone for months or years before becoming symptomatic. This is why routine X-rays and periodic exams are essential even when you feel fine.
Step Two
The Diagnostic Tests Dr. Nail Uses
Click any test below to expand a full explanation of how it's performed, what the results mean, and how it contributes to the final diagnosis.
Step Three
Putting It All Together
No single test is definitive on its own. Dr. Nail correlates all findings to arrive at a pulpal and periapical diagnosis before recommending treatment.
Pulpal Diagnosis
- —Normal pulp
- —Reversible pulpitis
- —Irreversible pulpitis (symptomatic or asymptomatic)
- —Pulp necrosis
- —Previously treated / previously initiated therapy
Periapical Diagnosis
- —Normal apical tissues
- —Symptomatic apical periodontitis
- —Asymptomatic apical periodontitis
- —Acute / chronic apical abscess
- —Condensing osteitis
These diagnostic categories follow the American Association of Endodontists (AAE) classification system used by endodontists and general dentists trained in endodontic diagnosis.
Common Questions
Diagnosis FAQs
Think you may need a root canal?
Dr. Nail will perform a thorough diagnostic evaluation — same-day appointments available.