Ever wondered what is really happening inside a tooth when a cavity forms? Our friendly mascot Lily, the LS ToothBuddy, walks you through it step by step in this short animation. Great for kids and grown-ups alike.
A Cavity Is Not "Sudden" — It Builds Up
A cavity (tooth decay) does not appear overnight. It is the result of a slow process that repeats every day, quietly, until a hole finally breaks through the surface of the tooth. The good news is that because it is a process, there are several points along the way where you can stop it.
Here is what happens, in the same order Lily shows in the video.
Step 1 — Sugar Arrives
Every time you eat or drink something with sugar — sweets, biscuits, cordial, soft drinks, even the natural sugars in milk left in a child's bottle overnight — a fresh supply of sugar lands on the tooth surface.
Step 2 — Bacteria Feed on the Sugar
Your mouth naturally has bacteria living in the sticky film called plaque. These bacteria love sugar. Within minutes of eating, they start feeding on it.
Step 3 — Bacteria Produce Acid
As the bacteria digest the sugar, they release acid as a waste product. This acid sits on the tooth and begins to dissolve the minerals in the hard outer enamel. This acid attack lasts around 20–30 minutes after every sugary snack or sip.
Step 4 — The Enamel Weakens and a Hole Starts
If sugar keeps arriving all day, the acid attacks never stop long enough for saliva to repair the enamel. Over weeks and months, the enamel loses so much mineral that its surface finally caves in — and a small hole (cavity) forms.
Step 5 — Decay Reaches the Nerve, and It Hurts
Once the hole is open, bacteria move deeper into the softer layer beneath the enamel and eventually toward the nerve. This is the stage that causes toothache, sensitivity to sweet and cold, and, if left alone, infection.
How to Break the Cycle
You do not have to give up sugar completely. What matters most is how often sugar reaches the teeth and how well the plaque is cleaned away:
- Brush twice a day with fluoride toothpaste — especially before bed, when saliva flow drops
- Cut down on frequent snacking and sipping — it is the constant grazing, more than the total amount, that keeps acid on the teeth
- Rinse with plain water after sugary food if you cannot brush
- Never let a child sleep with a bottle of milk or juice in the mouth
- Come for a check-up and scaling so early decay can be spotted and reversed before a hole forms
Catching decay at the "white spot" stage — before the hole appears — often means it can be remineralized instead of drilled and filled.
Have a Question About Your Child's Teeth?
If you have noticed a dark spot, a hole, or your child complaining of sensitivity, it is worth getting it looked at early. The team at LS Dental Clinic Ipoh Garden is happy to check and explain what is going on.
