The most common thing people say about a cavity is that it does not hurt, so it can wait. That is true about the pain and false about the tooth, and the gap between those two things is where most expensive dentistry comes from.
What is a cavity actually?
Bacteria in your mouth feed on sugars and produce acid. That acid dissolves minerals out of enamel. Saliva repairs some of this constantly — the process runs both ways all day.
Trouble starts when the dissolving outpaces the repairing. Enamel demineralises, then breaks down, and a hole forms. Once bacteria are inside that hole, they are somewhere a toothbrush cannot reach, and the process accelerates.
Teeth do not have a repair mechanism for lost structure. Bone heals. Skin heals. A tooth does not. What is gone stays gone, which is why a hole is a one-way event.
Why doesn’t it hurt yet?
Because the decay has not reached the nerve.
Enamel — the outer layer — has no nerve supply at all. You can lose a meaningful amount of it and feel nothing. Dentine underneath starts to register sensitivity. Only when decay approaches the pulp, where the nerve lives, does it become the pain people associate with “a bad tooth”.
So the sequence is: damage first, symptoms much later. By the time it hurts, you are usually several months and one treatment tier past the point where it would have been simple.
What actually changes if you wait?
Not whether it needs treating. Which treatment it needs.
| Stage | What is happening | Treatment | From |
|---|---|---|---|
| White spot | Minerals lost, no hole yet | Fluoride, cleaning, monitoring — the only stage that reverses | Check-up |
| Cavity in enamel | Hole through the outer layer | Filling | RM100 |
| Decay into dentine | Softer layer breaking down faster | Filling, larger | RM100 |
| Decay reaching the pulp | Nerve inflamed — this is when it hurts | Root canal treatment | RM300 per visit |
| Nerve dead, infection at root | Often stops hurting; abscess may follow | Root canal, or extraction | RM100 (extraction) |
| Too little tooth left | Not enough structure to restore | Extraction, then replacement | RM450+ to replace |
Each row down that table is more time in the chair, more money, and less of your own tooth left. Nobody moves up it.
The most misread signal in dentistry
A tooth that was hurting and has stopped is not a tooth that got better.
When decay reaches the pulp and the inflammation is severe enough, the nerve dies. A dead nerve sends no pain signals — so the pain switches off, sometimes over a day or two, and it feels like recovery.
What is actually happening is that bacteria now occupy the empty root canal system, and the infection continues at the root tip where there is still living tissue. That usually resurfaces weeks or months later as a swollen gum, an abscess, or a tooth that suddenly hurts to bite on.
If a tooth hurt badly and then went quiet, that is a reason to be seen, not a reason to relax. See what a swollen gum means for where it usually goes next.
Where do cavities actually start?
Three places, and two of them are invisible to you:
- The grooves on biting surfaces of back teeth — narrower than a toothbrush bristle. This is what fissure sealants address in children.
- Between the teeth, where the contact points touch. No brush reaches here. Floss or interdental brushes do. Decay between teeth is often only visible on an X-ray.
- At the gumline, particularly where gums have receded and exposed root surface, which has no enamel and decays faster than the crown of the tooth.
Notice that two of the three are places you cannot see and cannot brush. That is the entire argument for check-ups and for cleaning between the teeth.
What can you actually do about it?
Preventing more:
- Cleaning between teeth daily is the single highest-value habit most people are not doing
- Frequency of sugar matters more than quantity. Sipping a sweet drink across an afternoon keeps the mouth acidic for hours; the same drink in ten minutes does not
- Fluoride toothpaste, and spit rather than rinse afterwards — rinsing washes it straight off
- Regular check-ups, because the stage that costs least to treat is the one you cannot feel
What does not work: hoping, oil pulling, or waiting to see if it hurts. There is no home remedy that rebuilds lost tooth structure.
What happens at the appointment
At FTS Chin Dental in Likas, treating a cavity is usually one visit:
- We examine and, where needed, X-ray — decay between teeth and under existing fillings is often invisible otherwise
- We explain what we found and what it means for that tooth, including what happens if it is left
- The area is numbed, the decay is removed, and the tooth is filled and shaped so it bites correctly
- We tell you the price before starting
Fillings start from RM100. Root canal treatment from RM300 per visit. Those numbers are on our fillings and root canal page, and yours is confirmed after an examination.
If the tooth is already painful rather than just holed, start with what tooth pain means and what to do. If it is sharp with cold and settles quickly, why teeth get sensitive is the more likely fit.