What a dentist is actually looking for at a check-up

A dental check-up looks, from the chair, like someone poking about with a mirror and saying numbers to an assistant. It is a screening examination with a specific sequence, and knowing what each part is for makes it considerably less opaque, and makes the recommendations at the end easier to weigh.

The conversation first

What has changed since last time, whether anything hurts, and any updates to your general health and medications. This is not small talk. Diabetes, blood thinners, bisphosphonates, immunosuppression, pregnancy, heart valve history and smoking all directly change what is safe to do and what we should be looking for. An out-of-date medical history is a genuine safety problem, so it gets asked every time even though it feels repetitive.

The soft tissue examination

Any ulcer that has not healed within three weeks, a persistent red or white patch, or a lump that does not resolve is worth showing us without waiting for a scheduled appointment.

The teeth

Each tooth is checked systematically, surface by surface, with a mirror and light and gentle probing. We are looking for early demineralisation, actual cavitation, cracks, wear patterns and the state of every existing filling and crown, particularly the margins where they meet the tooth, because that is where decay starts underneath a restoration that still looks fine.

Wear patterns tell a story of their own. Flattened biting surfaces suggest grinding; scooped-out enamel suggests acid erosion; notches at the gum line suggest heavy brushing. Those findings change the advice more than the treatment.

The gums, in numbers

A blunt probe with millimetre markings is walked gently around each tooth, measuring how deep the gum attaches. Those numbers being read out are pocket depths. Up to about three millimetres is healthy; four and above indicates attachment has been lost, and we also record where it bleeds on probing.

This is the part people find least interesting and it is arguably the most important, because gum disease is painless until it is advanced and it is the leading cause of tooth loss in adults. It is also the only part of the examination that produces a baseline you can be compared against next year.

The bite and the joints

How the teeth meet, whether any tooth is taking more load than it should, and how the jaw joints move and sound. Uneven loading shows up years later as cracked teeth and failed restorations, and it is much cheaper to notice early.

Radiographs, and why not every time

X-rays are taken when there is a clinical reason, not by default at every visit. The main one is that decay between two touching back teeth is genuinely invisible to the eye, and so is bone level and anything below the root. A bitewing radiograph shows both.

The interval is based on your individual risk, so someone with a history of decay is imaged more often than someone with none. Doses from modern dental radiography are very small, but the principle is still to take them when they will change a decision and not otherwise.

What you get at the end

• What was found, in plain terms, and what it means if nothing is done about it.
• What needs treating now, what can be watched, and what is purely optional. These three categories should always be distinguished, and you are entitled to ask which one something falls into.
• A recall interval based on your risk rather than a fixed six months. Someone with active decay or unstable gums needs to be seen more often; someone stable may safely go longer.
• The specific hygiene changes that apply to what was actually found in your mouth, rather than general advice.

Why go when nothing hurts

Because the two most common dental diseases are both painless for most of their course. Decay does not hurt until it approaches the nerve, by which point the treatment is a root canal rather than a filling. Gum disease does not hurt until teeth are loose, by which point the bone is gone and cannot be recovered.

Pain is a late signal in dentistry, not an early one. Waiting for it is what turns small, cheap, quick treatments into large, expensive, unpleasant ones, and that is the entire economic argument for check-ups.