Children’s Cavity Treatment: The Golden Window to Avoid Root Canal Treatment and a Summary of Treatment Methods

Hello.

I am Kim Tae-hyung, director of Banpo Blanche Dental Clinic.

Among the parents who bring their children to our clinic, those who come after discovering a cavity are often the most worried.

They come in saying things like:

"The daycare sent home a notice saying my child has a cavity."

"I noticed a black spot on a molar while brushing my child’s teeth."

"My child is trying to chew only on one side."

The question we hear most often is whether the cavity requires root canal treatment or whether it can simply be filled.

To give you the conclusion first, the timing of discovery determines everything when it comes to cavities in children. Even with the same cavity, it is very common for treatment to be completed with resin if the child comes in a month earlier, but to require root canal treatment if the child comes in a month later.

That is why today I will summarize the differences between the stages of children’s cavity treatment, the golden window for avoiding root canal treatment,

and the characteristics of each treatment method all in one place.

Cavities in children progress much faster than those in adults

Before we get into the details, there is something parents should know.

Cavities in children progress two to three times faster than cavities in adults. Primary teeth have thinner enamel than permanent teeth, and the dentin is softer. As a result, it takes one to two years for a cavity in an adult to reach the dental pulp, while in a child it can reach the pulp in just three to six months.

Cavities in children’s molars are especially concerning. Molars have many deep grooves on their chewing surfaces, making it easy for food to become trapped. Once a cavity begins, it can quickly progress inward. In some cases, the outside may look fine even though the cavity has already advanced close to the pulp.

This is why dental checkups for children are recommended every three to four months. Six-month checkups, which are generally used for adults, may not be frequent enough to keep up with the rapid progression of cavities in children.

Cavity Stage 1: The golden window when treatment can end with resin

Cavities are divided into four stages according to how far they have progressed, and the true golden window is Stage 1 through the beginning of Stage 2.

Stage 1 is an enamel cavity. At this stage, the cavity is limited to the enamel, the outermost layer of the tooth. If it is discovered at this point, the dentist can lightly remove only the decayed area and fill it with resin, a white filling material. The treatment usually takes just 20 to 30 minutes, and it places the least burden on the child. In some cases, it can be performed without anesthesia.

Children usually feel little to no pain at this stage. That makes it very difficult for parents to notice. After brushing your child’s teeth at home, try shining a flashlight on the chewing surfaces of the molars. If you see a black spot or brown discoloration, it may be a Stage 1 cavity. Do not leave it untreated just because there is no pain; have it examined.

Cavity Stages 2–3: The deeper the cavity, the more extensive the treatment

From Stage 2 onward, the cavity has entered the dentin. Dentin is softer than enamel, so once a cavity reaches it, it can spread quickly sideways. At this stage, the cavity may be too extensive to treat with resin alone, requiring an inlay, a custom-made filling, or a crown, a restoration that covers the tooth.

For primary molars, the most important goal is to preserve the space for the child’s permanent teeth until the cavity has reached the dentin. Active treatment is therefore necessary. If a primary tooth is lost too early, the space available for the permanent tooth to emerge may become narrower, often leading to orthodontic treatment later.

Stage 3 means that the cavity has reached close to the pulp. If your child begins to say that their tooth feels sensitive to cold water or sweet foods, you can assume that the cavity is already approaching Stage 3. If you come in promptly at this point, it may be possible to avoid root canal treatment with a pulp-protective procedure, known as indirect pulp capping. However, if treatment is delayed for a few more days, the cavity may progress to Stage 4.

Cavity Stage 4: The stage requiring root canal treatment for a child’s tooth

Stage 4 means that the cavity has invaded the pulp. At this stage, root canal treatment is almost always necessary.

If your child says that the tooth throbs even when they are still, or cannot sleep at night because of pain, there is a very high possibility that it has reached Stage 4.

Root canal treatment for primary teeth is performed somewhat differently from root canal treatment for permanent teeth. If a child has difficulty cooperating, a simplified procedure completed in one or two visits, called a pulpotomy, may be used. A prefabricated crown is also often placed over the tooth to help preserve the space for the permanent tooth.

Once treatment reaches the root canal stage, the burden in terms of both cost and time increases considerably. It can also cause significant emotional stress for the child.

In fact, it is quite rare for children to visit the dentist after the cavity has progressed this far. However, these cases do occasionally occur, and we find ourselves saying, "If only you had come a month earlier…" Please pay a little more attention to your children’s teeth.

What parents should be sure to do

Although I have summarized the treatment methods for each stage, the real key is discovering cavities at Stages 1–2.

If you come in at that point, it is easier on the child and places the least burden on the parents.

If your child receives regular dental checkups every three to four months, most cavities can be identified at Stages 1–2.

In the permanent teeth, a single X-ray can reveal cavities between adjacent teeth that cannot be seen from the outside. We recommend making sure your child receives an X-ray at least once a year during checkups.

More than 90% of cases in which a child’s cavity progresses to root canal treatment involve children who did not receive regular checkups and only came in after the pain began. By the time pain develops, you should consider the cavity to have already reached a late stage.

Children’s cavities can differ completely in treatment scope and cost depending on when they are discovered.

Having them identified through regular checkups before pain begins is the best thing parents can do.

If you notice a black spot on your child’s molar,

or are concerned that your child is chewing only on one side, do not delay—make sure to schedule a dental examination.

This has been Banpo Blanche Dental Clinic, wishing your children healthy smiles.

Please feel free to leave any questions in the comments.