Toothache that comes and goes: what it might mean and when to see a dentist.

A twinge when drinking something cold, pain while chewing, then nothing for hours or even days. When toothache comes and goes, it's easy to interpret its disappearance as a reassuring sign. In reality, the intermittency only describes the way the pain manifests itself: it doesn't, by itself, determine the cause or its severity.

Rather than wondering whether the tooth hurts all the time, it's best to note when the pain appears, how long it lasts, whether it recurs in the same spot, and what other symptoms accompany it. These factors don't allow for self-diagnosis, but they help determine when it's appropriate to schedule a checkup and when a more rapid evaluation is needed.

Why pain can appear, disappear, and then return

According to Studiodentisticoleone.it (a dentist based in Naples), many toothaches are triggered only by a stimulus. A cold drink, a sweet food, brushing, or the pressure of chewing can stimulate the most sensitive parts of the tooth. When the stimulus ceases, the sensation may also cease, without necessarily resolving the underlying condition.

A significant example is a cracked tooth. A crack can cause irregular twinges when biting, when pressure is released, or when the tooth is exposed to very high or low temperatures. The discomfort can be difficult to pinpoint and may not occur at every meal, precisely because it depends on how and where the force is applied.

Even tooth decay doesn't always cause constant pain. In the initial stages, it may be asymptomatic; as it progresses, sensitivity to cold, heat, or sweets may develop, leading to actual toothache. Worn restorations, exposed dentin, receding gums, or pulp inflammation can cause equally variable symptoms.

Therefore, the fact that the pain subsides does not mean the tooth is healed. More indicative are its recurrence, increased frequency, a progressively longer duration, or its appearance in response to increasingly mild stimuli.

What it can indicate based on when it occurs

The context in which the pain occurs provides useful information, but it doesn't establish a clear correlation between symptom and diagnosis. A twinge caused by cold, for example, can be linked to exposed dentin, but also to a cavity, a crack, or a damaged restoration. Reducing the problem to the formula "cold equals tooth sensitivity" therefore risks being misleading.

What happens after the stimulus is removed also matters. A discomfort that subsides quickly is different from a pain that continues, pulsates, or appears spontaneously, but even this distinction isn't enough to determine which treatment is necessary. Persistence after applying heat or cold is something to report to the dentist, not automatic proof that root canal therapy is needed.

Pain while chewing deserves specific attention. It may be caused by a cracked tooth, but also by inflammation of the tissues around the root, deep decay, or a damaged restoration. It's helpful to note whether the discomfort occurs when clenching your teeth, biting down on a hard food, or when you release pressure.

Sometimes the pain is diffuse or seems to move from one tooth to another. The sensation doesn't always coincide with the point of origin: some sinus disorders or, more rarely, forms of neurological pain can be felt in the dental area. However, these possibilities shouldn't be a shortcut to ruling out a dental cause, which remains the first thing to check.

The four most useful pieces of information are therefore simple: what stimulus causes the pain, how long it lasts, where it is perceived and how often it returns.

When to have it evaluated and what signs require urgency

A single, very brief episode can be observed, but recurring pain in the same spot shouldn't be ignored simply because it disappears between episodes. It's a good idea to schedule an appointment if the discomfort lasts several days, increases in frequency, occurs regularly during meals, or makes biting painful.

The NHS recommends seeing a dentist if toothache lasts more than two days. However, this recommendation shouldn't be interpreted as a minimum period during which it's always safe to wait: the presence of other symptoms may require an earlier check-up.

Fever, severely red gums, a bad taste in the mouth, discharge, localized swelling, or increasing pain may accompany an infection and require prompt dental evaluation. A broken or displaced tooth following trauma, a loose filling associated with pain, or marked difficulty opening the mouth should also not be treated as normal sensitivity.

Swelling extending to the face, neck, or area near the eye is a different matter, especially if there's difficulty breathing, speaking, or swallowing. These are signs that prompt urgent medical attention. The same applies to serious trauma to the face or jaw, and heavy bleeding that doesn't stop.

Pain intensity alone does not determine urgency. Moderate discomfort accompanied by swelling and fever may be more significant than a very severe but brief twinge without other symptoms.

What to look for and how to behave while waiting

Before your appointment, it can be helpful to briefly note the episodes: affected tooth or area, trigger, duration, frequency, and any associated symptoms. A description like "a twinge on my lower molar when I drink cold water, it lasts about ten seconds and has appeared four times this week" is more informative than a generic "it hurts every now and then."

While waiting, it's best to avoid chewing on the painful area and temporarily limit very hot, cold, or sweet foods that cause discomfort. Oral hygiene should be maintained, but gently, without repeatedly pressing on the tooth to check whether the pain is still present.

Painkillers can relieve symptoms, but they don't eliminate the cause. Their choice should take into account age, pregnancy, allergies, medical conditions, and other therapies; it's therefore important to follow the package insert and consult your pharmacist or doctor when necessary. Do not apply tablets or irritants directly to the tooth or gums.

Above all, a temporary improvement shouldn't lead to canceling a scheduled checkup. In intermittent toothache, the most important thing isn't just that the pain has gone away, but that it keeps returning.