Tooth decay: stages, treatment and prevention in Luxembourg

Tooth decay is the gradual destruction of a tooth by acids produced by plaque bacteria feeding on sugars. It starts silently, as a small chalky white spot on the enamel, and can end in a throbbing toothache if left to run its course. In Luxembourg, the dentist is the specialist who detects and treats it — and the earlier decay is caught, the simpler the treatment. A cavity never heals by itself: the only real lever you have is to see a dentist before it starts to hurt.

How a cavity is born

It all begins with dental plaque, the sticky film of bacteria that settles back onto your teeth within hours of every brushing. Each time you eat or drink something sugary, those bacteria turn the sugar into acids, and the acids slowly dissolve the minerals in the enamel. At first, nothing shows and nothing hurts: between meals, saliva repairs part of the damage. It is when acid attacks come too often — snacking, soft drinks sipped throughout the day — that the balance tips and demineralisation wins.

The first visible sign is a matt white spot, often near the gum line or between two teeth. At this point the enamel surface is still intact, and this is the only stage at which the process can still be stopped, sometimes even reversed, with rigorous hygiene and fluoride. But someone has to spot it first — and that someone is rarely the patient.

What you feel at each stage

Enamel: nothing at all

As long as decay stays within the enamel, it is completely painless, because enamel contains no nerves. The white spot darkens, then a small hole forms. Many cavities pass through this whole stage unnoticed — which is exactly why routine dental check-ups exist.

Dentine: the tooth turns sensitive

Beneath the enamel lies dentine, a softer tissue crossed by thousands of tiny channels connected to the nerve. Once decay reaches it, it spreads faster and the first warnings appear: a short twinge with cold drinks, sweets, sometimes brushing. The pain stops the moment the trigger is removed. It is a valuable alarm, often dismissed because “it goes away on its own”.

The pulp: the raging toothache

At the centre of the tooth sits the pulp, home to the nerve and blood vessels. When bacteria reach it, inflammation becomes intense: spontaneous, throbbing pain that wakes you at night and worsens when you lie down or with heat. This is the classic toothache. Untreated, the infection can then spread into the bone and form an abscess, with swelling and sometimes fever — a situation that should not wait any longer.

Why a cavity never heals on its own

Unlike skin or bone, destroyed enamel does not grow back: once a cavity has formed, the tooth cannot repair it. Worse, the hole traps plaque and becomes impossible to clean, which speeds up the destruction. And when the pain of a severe toothache eventually fades by itself, that is not a cure: it usually means the nerve has died, while the infection keeps advancing deeper, silently.

Treatment, stage by stage

The earlier decay is caught, the lighter the treatment. An early enamel lesion can sometimes be stabilised without drilling, through remineralisation. A cavity that has reached the dentine is treated by removing the decayed tissue and placing a filling — nowadays most often a tooth-coloured composite. Once the pulp is involved, the tooth needs root canal treatment: the dentist removes the infected nerve, disinfects the canals and seals them. A badly weakened tooth is then protected with a crown. And when destruction has gone too far, extraction is sometimes the only option left. The same white spot that could have been dealt with in a single visit may, months later, demand several appointments — that is the whole point of acting early.

Prevention that actually works

• Brush twice a day for two minutes with a fluoride toothpaste — fluoride strengthens enamel and helps repair the earliest acid damage. The evening brush matters most: protective saliva flow drops sharply during sleep.
• Clean between your teeth with floss or interdental brushes: that is where most cavities start, out of reach of the toothbrush.
• Space out sugar intake rather than only reducing the amount: repeated acid attacks are what cause cavities. A soft drink sipped all afternoon does more harm than a dessert eaten with a meal. Water remains the default drink.
• Regular scaling at the dentist removes the tartar brushing cannot, and gives the dentist a chance to spot early lesions.

The annual check-up in Luxembourg

The single best habit is a check-up with a dentist at least once a year, even without any pain — precisely because the cavities caught early are the ones that do not hurt. In Luxembourg, routine dental care, including consultations, regular check-ups, an annual scaling and the treatment of cavities, is covered by the national health fund (Caisse nationale de santé) under the usual health insurance rules; attending regular check-ups can even qualify you for more favourable coverage of certain treatments. Conditions and procedures are detailed on the CNS website. If you develop severe pain with facial swelling or fever, do not wait: contact a dentist quickly, use the on-call dental service, and in a life-threatening emergency call 112.