Not every painful tooth needs a root canal, and not every tooth that needs one hurts. The only way to know is an examination and an x-ray — but some patterns are worth recognising, because acting on them early is what keeps the tooth.
Pain that lingers after the trigger has gone
A healthy tooth can be briefly sensitive to something cold and settle within seconds. A tooth with an inflamed nerve does not settle — the ache carries on after the ice water has gone, sometimes for minutes. That lingering quality is more telling than the intensity.
Pain that wakes you
Toothache that is worse lying down, or that wakes you at night, is a classic sign of pulp inflammation. Blood pressure to the head increases when you lie flat, and a nerve trapped inside a rigid tooth has nowhere to expand.
Pain on biting, or a tooth that feels raised
When infection reaches the tip of the root, the tissue around it inflames and the tooth can feel slightly high when you bite. Sharp pain on release — biting down then letting go — can also point to a crack that has reached the pulp.
A bump on the gum
A small pimple-like swelling near the root of a tooth is a sinus tract: infection finding a route to drain. It often relieves the pain, which makes it dangerously easy to ignore. The infection has not gone; it has found an exit.
Discolouration
A single tooth that has darkened relative to its neighbours, particularly after a knock, may have a nerve that has died. This one frequently arrives with no pain at all.
When pain stops on its own
This is the sign most often misread as good news. Severe toothache that disappears over a day or two can mean the nerve has died — the pain stops because the tissue that was signalling is no longer alive. The infection continues without it.
What to do
Any of the above is a reason to be seen rather than to wait. Call (703) 250-5072. If there is facial swelling, or swelling that is spreading toward the eye or down the neck, that is a hospital matter first — see our emergency guide.
Frequently Asked Questions
Frequently Asked Questions
Frequently Asked Questions
Frequently Asked Questions
Can a tooth need a root canal without hurting?+
Yes. A nerve that has already died often stops signalling, and the problem can be found on a routine x-ray with no symptoms at all. Discolouration of a single tooth is another painless sign.
My toothache stopped by itself — am I fine?+
Not necessarily. Pain that disappears after being severe can mean the nerve has died rather than healed, and the underlying infection carries on. It is worth being checked rather than assumed resolved.
Is a bump on my gum serious?+
A pimple-like swelling near a tooth root is usually a drainage tract from an infection. It can relieve pain, which makes it easy to ignore, but it indicates an active infection that needs treatment.
Cavities develop gradually, not overnight. Bacteria in your mouth feed on sugars and starches, producing acids that pull minerals from your enamel. Saliva repairs some damage, but frequent acid attacks overwhelm it, and plaque lets bacteria attack the tooth directly. Left unchecked, decay progresses from the enamel into the dentin, pulp, and eventually an abscess. Good hygiene, diet, and regular dental visits keep cavities preventable.