Why Your Teeth Are Suddenly Sensitive and What It Actually Means

Sensitivity is a symptom, not a diagnosis. When someone tells me their teeth suddenly hurt with cold drinks, my job is to figure out which of several very different problems is behind it, because the fixes aren't remotely the same.

Receding gums expose root surface, which has no enamel covering it and is far more sensitive than the crown of the tooth. This is the most common cause I see, and it can driven by brushing too hard with a stiff brush. There are also other causes though like malocclusion, tight frenum attachments, or bruxism/grinding of yor teeth.

Enamel erosion from acidic foods, drinks, or reflux thins the protective layer over time. Citrus, soda, sparkling water, and wine all contribute. Reflux is an underrated culprit, I've diagnosed it from wear patterns on teeth before the patient had any idea.

Clenching and grinding stresses teeth and wears down enamel, often at night without the person knowing. Sensitivity that's worse in the morning is a strong hint.

A cracked tooth produces sharp, brief pain on biting or with cold. This one needs prompt attention, cracks propagate, and the difference between catching one early and late is often the difference between a crown and a root canal.

A cavity or failing filling approaching the nerve causes sensitivity that lingers after the stimulus is gone. That lingering quality is the key detail I listen for.

Sensitivity toothpaste helps with the first two causes, but will fix the last three. So if you've been using it for a few weeks without improvement, that's useful information, it means we should look for something structural. Come in and let me find it.