Succedaneous Teeth: What Are They and Why Do They Matter?

When discussing dental development, dentists often use specialized terminology. One such term you might hear during a pediatric dental visit is “succedaneous.” But what exactly does this mean, and how does it relate to your child’s dental health?

What Are Succedaneous Teeth?

In dentistry, the term succedaneous refers to the permanent teeth that replace, or “succeed,” the primary (baby) teeth. The word itself comes from the Latin word succedere, which means to follow or replace.

There are exactly 20 succedaneous teeth in the human mouth. They include the permanent incisors, canines, and premolars. These teeth develop inside the jawbone underneath the primary teeth during childhood.

Which Teeth Are Not Succedaneous?

Interestingly, not all permanent teeth are succedaneous. The permanent molars (the large grinding teeth at the back of the mouth) erupt into empty spaces in the jaw where no baby teeth previously existed. Because they do not replace any primary teeth, permanent molars are classified as nonsuccedaneous.

Since adults typically have 32 permanent teeth (including wisdom teeth) and there are only 20 succedaneous teeth, the remaining 12 teeth are nonsuccedaneous molars.

How Succedaneous Teeth Develop

The development of succedaneous teeth is a fascinating biological process. Here is how it typically happens:

1. Early Development: Long before they are visible, succedaneous teeth begin forming in the jawbone underneath the roots of the baby teeth.
2. Root Resorption: As the permanent tooth grows and pushes upward, it puts pressure on the root of the baby tooth above it. This pressure causes the root of the baby tooth to gradually dissolve or “resorb.”
3. Loosening and Exfoliation: Once the root of the baby tooth has completely resorbed, the tooth becomes loose and eventually falls out (exfoliates).
4. Eruption: With the baby tooth out of the way, the succedaneous permanent tooth erupts through the gums and takes its designated place in the dental arch.

Why Understanding Succedaneous Teeth Is Important

Knowing the difference between primary, succedaneous, and nonsuccedaneous teeth is crucial for proper dental care:

• Space Maintenance: Baby teeth act as natural space maintainers for the succedaneous teeth developing below them. If a baby tooth is lost prematurely due to decay or trauma, the surrounding teeth may shift into the empty space, blocking the succedaneous tooth from erupting properly. This often leads to crowding and the need for orthodontic treatment later in life.
• Monitoring Development: During routine checkups, your dentist will take X-rays to monitor the development and position of the succedaneous teeth. This helps identify any potential issues, such as impacted teeth or missing permanent teeth (hypodontia), early on.

Your child’s dental development is a complex and highly coordinated process. Regular dental visits are essential to ensure that both the primary teeth and the succedaneous teeth are healthy and developing properly.

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