How do I know if I have a cavity?

Early cavities often have no symptoms. As they progress, you may notice tooth sensitivity, pain when eating sweet or hot/cold foods, visible holes or dark spots on teeth, or bad breath. Regular dental check-ups are the best way to catch cavities early.

Can cavities heal on their own?

Once a cavity has formed (a hole in the enamel), it cannot heal on its own and will continue to grow. Very early-stage demineralisation (white spots) can sometimes be reversed with fluoride treatment and improved oral hygiene, but established cavities require a filling.

How often should I visit the dentist for a check-up?

We recommend every 6 months for most patients. This allows your dentist to catch any issues early and perform professional cleaning to remove tartar that brushing alone cannot remove. At Trust Dental, scaling and polishing starts from $85 (before GST 9%).

Are electric toothbrushes better than manual ones?

Both can be effective when used correctly. Electric toothbrushes can be helpful for people who struggle with proper brushing technique, have limited hand mobility, or tend to brush too hard. The most important thing is brushing for a full 2 minutes with fluoride toothpaste, twice a day.

How to Prevent Cavities and Tooth Decay | Trust Dental Surgery Singapore

What Causes Cavities?

Your mouth is home to hundreds of types of bacteria. Some of these bacteria form a sticky, colourless film called plaque that coats your teeth throughout the day. When you eat or drink anything containing sugar or starch, the bacteria in plaque feed on these carbohydrates and produce acid as a by-product.

This acid attacks the hard outer layer of your teeth — the enamel — dissolving the minerals that keep it strong. Over time, repeated acid attacks weaken the enamel until a hole forms. That hole is a cavity, and once it has developed, it will not repair itself. Without treatment, the decay continues to spread deeper into the tooth.

How Cavities Develop: The Stages

Tooth decay does not happen overnight. It progresses through several stages, and the earlier it is caught, the simpler the treatment.

White spots on enamel — The earliest sign. Minerals are being lost from the enamel surface (demineralisation). At this stage, the process can still be reversed with fluoride and good oral hygiene.
Enamel decay — The enamel breaks down further and a small cavity forms. You may not feel anything yet, but a dentist can detect it during a check-up.
Dentin decay — The decay reaches the softer layer beneath the enamel called dentin. You may start to notice sensitivity or discomfort, especially with sweet, hot, or cold foods.
Pulp infection — If untreated, the decay reaches the innermost part of the tooth — the pulp — which contains nerves and blood vessels. This causes significant pain and typically requires root canal treatment.
Abscess — The infection spreads beyond the tooth root, forming a pocket of pus. This can cause swelling, fever, and severe pain. An abscess requires urgent dental treatment.

Daily Habits to Prevent Cavities

The good news is that cavities are largely preventable with consistent daily care. Here are the habits that make the biggest difference.

1. Brush Properly Twice a Day

Brushing is your first line of defence against plaque. Use a soft-bristled toothbrush and fluoride toothpaste, and brush for a full two minutes each time — once in the morning and once before bed. Hold the brush at a 45-degree angle to your gumline and use gentle, circular motions rather than aggressive scrubbing. Do not forget to brush the chewing surfaces and the inner surfaces of your teeth.

2. Floss Daily

Your toothbrush cannot reach the tight spaces between your teeth, yet these are some of the most common places for cavities to form. Flossing once a day removes plaque and food particles from between teeth and below the gumline. If you find traditional floss difficult to use, interdental brushes or water flossers are good alternatives.

3. Use Fluoride

Fluoride strengthens tooth enamel and helps reverse early-stage demineralisation. Make sure your toothpaste contains fluoride — look for at least 1,000 ppm (parts per million) for adults. A fluoride mouthwash can provide additional protection, especially if you are prone to cavities. Use it at a different time from brushing so the fluoride has maximum contact with your teeth.

4. Limit Sugary and Acidic Foods

Sugar is the primary fuel for cavity-causing bacteria. Fizzy drinks, sweets, fruit juices, and starchy snacks like crisps all contribute to acid production in the mouth. You do not need to eliminate these foods entirely, but try to enjoy them at mealtimes rather than throughout the day. Acidic foods and drinks — such as citrus fruits, vinegar-based dressings, and carbonated water — can also soften enamel, so avoid brushing immediately after consuming them. Wait at least 30 minutes.

5. Drink Water After Meals

Water helps wash away food particles and dilutes the acids produced by bacteria. Rinsing your mouth with water after eating is a simple but effective habit, particularly when you cannot brush straight away. In Singapore, tap water is safe to drink and makes this an easy step to build into your routine.

6. Avoid Constant Snacking

Every time you eat, the bacteria in your mouth produce acid for about 20 to 30 minutes. If you snack frequently throughout the day, your teeth are under near-constant acid attack with little time to recover. Try to limit eating to defined meal and snack times, and choose tooth-friendly options like cheese, nuts, or raw vegetables when you do snack.

Professional Prevention

Good home care is essential, but it is not enough on its own. Professional dental care plays a vital role in keeping cavities at bay.

Regular Scaling and Polishing

Even with diligent brushing and flossing, plaque can harden into tartar (calculus), which cannot be removed at home. A professional scaling and polishing removes tartar build-up from all surfaces of your teeth, including hard-to-reach areas. At Trust Dental, scaling and polishing starts from $85 (before GST 9%), and CHAS subsidies are available for eligible patients.

Dental Check-ups Every 6 Months

Regular check-ups allow your dentist to detect early signs of decay — including those initial white spots — before they become full-blown cavities. A check-up also includes an examination of your gums, tongue, and soft tissues for any other concerns. We recommend visiting your dentist every six months, or more frequently if advised.

Fissure Sealants for Children and Teens

The chewing surfaces of back teeth (molars) have deep grooves and pits where food and bacteria can easily become trapped. Fissure sealants are thin, protective coatings applied to these surfaces to seal out plaque and acid. They are especially beneficial for children and teenagers, whose newly erupted permanent teeth are most vulnerable to decay.

Fluoride Treatments

In-clinic fluoride treatments provide a concentrated dose of fluoride directly to the teeth, offering stronger protection than over-the-counter products alone. Your dentist may recommend fluoride treatments if you are at higher risk of cavities due to dry mouth, a history of frequent decay, or other factors.

What If You Already Have a Cavity?

If a cavity has already formed, it will not go away on its own — but the sooner it is treated, the simpler and less costly the procedure.

Dental fillings — For most cavities, a filling is all that is needed. Your dentist removes the decayed portion of the tooth and fills the space with a tooth-coloured composite material. The procedure is straightforward and usually completed in a single visit.
Root canal treatment — If the decay has reached the pulp (the nerve of the tooth), a root canal is needed to remove the infected tissue, clean the canal, and seal the tooth. At Trust Dental, root canal treatment starts from $650 (before GST 9%). While the idea of a root canal can sound daunting, modern techniques and anaesthesia make it a comfortable procedure.

The key message is this: the earlier you address a cavity, the less invasive the treatment. A small filling is far simpler — and far less expensive — than a root canal or extraction down the line.

Special Considerations

Some groups face a higher risk of cavities and may need to take extra precautions.

Children — Baby teeth are thinner and more susceptible to decay. Start brushing your child's teeth as soon as the first tooth appears, and supervise their brushing until they are at least seven years old. Limit sugary drinks and snacks, and ask your dentist about fissure sealants.
Elderly patients — Receding gums can expose tooth roots, which are softer than enamel and more prone to decay. Medications that cause dry mouth are also common in older adults. If you are over 60, speak to your dentist about tailored prevention strategies.
Patients with dry mouth — Saliva plays a crucial role in neutralising acids and washing away food debris. Conditions or medications that reduce saliva flow significantly increase cavity risk. Stay hydrated, chew sugar-free gum to stimulate saliva, and ask your dentist about saliva substitutes.
Braces wearers — Brackets, wires, and bands create additional surfaces where plaque can accumulate. If you wear braces, take extra care with brushing (use an interdental brush or orthodontic brush), avoid sticky and hard foods, and keep up with your regular dental check-ups.

Preventing cavities comes down to a combination of good daily habits and regular professional care. If it has been more than six months since your last dental visit, now is a good time to book a check-up.

How to Prevent Cavities and Tooth Decay