The Ugly Truth About Tooth Decay: How It Happens and What You Can Do to Prevent It

Tooth decay is one of the most common health conditions in Australia and it affects people of every age. It develops quietly, often without any pain until it is well advanced, and it can lead to more serious problems if it is left alone. The useful part is that it is largely preventable once you understand what actually causes it.

Understanding Tooth Decay

Tooth decay — also called dental caries, or simply cavities — is a process rather than a single event. Bacteria living in dental plaque feed on the sugars and refined starches in what you eat and drink, and produce acid as a by-product. That acid pulls minerals out of the enamel, the hard outer layer of the tooth.

Your saliva works against this, neutralising acid and returning minerals to the enamel between meals. Decay happens when the demineralising outpaces the repair, day after day. The first visible sign is often a chalky white patch rather than a hole, and at that stage the damage can sometimes be reversed. Once the surface breaks down into a cavity, it will not repair itself and needs restoring.

Factors Contributing to Tooth Decay

1. Plaque left on the teeth. Brushing twice a day with fluoride toothpaste and cleaning between the teeth daily removes the plaque film where these bacteria live. The surfaces people miss most — along the gum line and between the back teeth — are exactly where decay tends to begin.
2. Sugary and acidic food and drink. Quantity matters, but frequency matters more, because each exposure starts an acid attack that continues for a while afterwards. Sipping soft drink, cordial, juice or sweetened coffee across a day keeps the mouth acidic almost continuously. Acidic drinks also erode enamel directly, with or without the bacteria.
3. Dry mouth. Reduced saliva — from certain medications, some medical conditions, dehydration, mouth breathing or alcohol — removes your main natural defence. If your mouth is regularly dry, tell your dentist, because it changes both your risk and what you should be doing about it.
4. Deep grooves and crowded teeth. The anatomy you were born with plays a part. Deep fissures in the molars and tight contacts between crowded teeth trap plaque and are harder to clean well, no matter how conscientious you are.
5. Existing dental work and gum recession. The margins of older fillings and exposed root surfaces are more vulnerable than intact enamel, which is one reason decay risk changes as you get older rather than staying fixed.

The Ugly Truth: What Happens If Decay Is Left Alone

1. Cavities. As the enamel breaks down, a hole forms. It may cause no symptoms at first, then sensitivity to hot, cold or sweet things, then discomfort when biting.
2. Sensitivity. Once decay reaches the dentine beneath the enamel, the tooth becomes more reactive, because dentine connects to the nerve through thousands of microscopic tubules.
3. Pulp infection. If decay reaches the pulp at the centre of the tooth, the nerve and blood supply become infected. This is a common cause of severe toothache, and it usually means root canal treatment or extraction rather than a simple filling.
4. Abscess and spreading infection. Infection can travel through the tip of the root into the surrounding bone, producing swelling and, occasionally, an infection that needs urgent care.
5. Tooth loss and its knock-on effects. A tooth that cannot be saved has to come out, and neighbouring teeth tend to drift towards the gap, which can affect the bite and make cleaning harder still.

None of that happens overnight, and none of it is inevitable. It is simply what the process looks like when it is left unmanaged over a period of years.

Prevention and Treatment

1. Cleaning. Brush for two minutes twice a day with fluoride toothpaste, angling the bristles towards the gum line, and clean between the teeth daily with floss or interdental brushes. Spit rather than rinse after brushing, so the fluoride stays on the teeth where it is doing its work.
2. Diet. Reduce how often sugar and acid reach your teeth, not only how much. Keep sweet drinks to occasional rather than everyday, drink water — fluoridated tap water where it is available — between meals, and give your mouth time to recover between eating occasions.
3. Fissure sealants. A thin coating placed over the deep grooves of the back teeth seals off the spots a toothbrush bristle cannot reach. Sealants are used most often for children and teenagers, and they do not involve removing tooth structure.
4. Fluoride. Fluoride toothpaste is the everyday version. A professionally applied varnish or a higher-strength paste may be suggested if your risk is high, and your dentist will assess whether either is appropriate for you rather than applying it routinely.
5. Regular check-ups. Decay is simplest to deal with when it is small, and small decay does not hurt. A routine examination and clean, with X-rays where they are warranted, is how it gets found at that stage instead of the painful one.

When treatment is needed, what it involves depends on how far the decay has gone. Early demineralisation can sometimes be managed without drilling at all. A cavity in enamel or dentine is usually restored with a filling. Extensive decay that leaves the tooth weakened often needs a crown to hold it together. Decay that has reached the pulp needs root canal treatment or extraction — both are invasive procedures, and your dentist will explain the risks and the alternatives before you decide.

Looking After Your Teeth with Helix Dental

Tooth decay is common, largely preventable and very manageable when it is picked up early. Good daily cleaning, sensible choices about how often you eat and drink sugar, and check-ups at the interval your dentist recommends do most of the work between them.

Helix Dental is a general and cosmetic dental practice at 2/299 Rio Vista Blvd, Mermaid Waters, on the Gold Coast. If it has been a while since your last examination, or you have noticed sensitivity, a rough edge or a mark on a tooth, call us on 07 5572 8969 or email hello@helixdental.com.au to arrange an appointment.