Diagnosis and Tests for Dental Caries

Cavities are diagnosed long before they hurt - if someone looks. Here is how dentists find them and why the looking matters more than the drilling.

How the dentist checks

• Visual examination: dried teeth under good light - white spots, brown staining, visible holes, broken fillings
• Gentle probing: a blunt explorer checks texture - sticky softness suggests active decay; hard dark areas may be arrested
• Bitewing X-rays: the workhorse - they reveal decay BETWEEN teeth and under old fillings that no eye can see, and show how close decay is to the nerve
• Transillumination and other aids: light shone through the tooth, and in some clinics laser or digital caries detectors
• For suspicious deep lesions: sometimes a small X-ray of the root tip (periapical) to check for abscess

Why early detection changes everything

• A between-teeth cavity caught on a routine bitewing is a small filling; caught by pain a year later, it is often a root canal
• White-spot lesions caught early may not need drilling at all - fluoride and habit change can reverse them
• Children, heavy snackers, people with dry mouth and anyone with past decay benefit from checkups every 6 months; low-risk adults at least once a year

What you can check at home

• Look in good light: new white or brown spots, visible pits, dark lines in grooves
• Feel with the tongue: roughness, holes, food catching repeatedly in one spot
• Note the triggers: which tooth twinges to cold or sweet
• Home checks complement the dentist, never replace - between-teeth decay is invisible without X-rays

One-line summary

Diagnosing caries is eyes, gentle probing and bitewing X-rays finding decay while it is still a small filling or a reversible spot - because the cavity found at a checkup is always smaller, cheaper and simpler than the one found by pain.