A wince when eating ice cream or a flinch with hot soup — brief sensitivity that passes quickly — is often the earliest pain signal of a cavity that’s entered the dentin. It’s different from the normal sensitivity some children have, which tends to be generalised. Cavity sensitivity is usually one tooth and consistent with a specific stimulus.

Sweet sensitivity is particularly telling. Bacteria in a cavity produce acid that irritates exposed dentin when sugar arrives — the child may say a tooth “stings” after sweets. This is a reliable early sign that the enamel barrier has been breached.

White or chalky spots are the earliest visible sign — they indicate the enamel surface is beginning to demineralise. This stage is sometimes reversible with fluoride before an actual cavity forms. Brown or black spots indicate decay that has progressed further. Staining and decay can look similar to a parent — only a clinical exam can tell the difference.

Cavities between teeth are almost never visible to the naked eye. These are the ones X-rays find. A tooth that looks fine from the outside can have significant between-tooth decay, which is why visual inspection at home doesn’t replace professional exams.

A child who consistently chews on one side, cuts food into smaller pieces than usual, or resists certain textures may be compensating for dental pain without being able to articulate what’s wrong. Younger children especially communicate dental discomfort through behaviour rather than language.

A cracked or fractured tooth — not necessarily a cavity — can also cause pain with biting pressure. The child may tolerate biting down but wince on release. Either way, the pattern warrants a dental evaluation.

A child who suddenly refuses foods they used to enjoy — particularly hard, crunchy, cold, or sweet foods — may be avoiding pain they can’t fully explain. Disrupted sleep from dental discomfort is also common with more advanced decay or infection. These behavioural changes can have other causes, but dental pain is worth ruling out early.

Bad breath in children is often diet-related or from dry mouth during sleep. Persistent bad breath that doesn’t resolve with brushing can indicate bacteria accumulating in an active cavity or early gum disease. An abscess has a particularly distinctive smell. Alone, this sign doesn’t confirm a cavity — but combined with any of the others, it adds weight to scheduling promptly.