2200 G.A.R. Hwy
Swansea, MA 02777
508-233-3341
Why Are Adult Teeth Coming in Behind Baby Teeth?
Parents are often surprised to discover a permanent tooth erupting behind a baby tooth that has not yet fallen out. This common situation, sometimes called "shark teeth," occurs frequently during normal development. Understanding why it happens and when intervention may be needed can help parents feel more confident during this stage of growth.
What are "Shark Teeth"?
Parents are often surprised to notice a permanent tooth erupting behind a baby tooth that has not yet fallen out. This common situation is often referred to as "shark teeth" because two rows of teeth may briefly be visible at the same time. While it can look concerning, shark teeth are often a normal part of dental development during the transition from baby teeth to permanent teeth, occurring in approximately 10% of all children.
Why Do Adult Teeth Sometimes Erupt Behind Baby Teeth?
Permanent teeth develop beneath the baby teeth and gradually move into position as the roots of the primary teeth dissolve. Occasionally, the permanent tooth erupts before the baby tooth becomes loose enough to fall out. This is especially common with the lower front teeth, though it can happen anywhere in the mouth. In many cases, the baby tooth will loosen naturally over the following weeks or months as the permanent tooth continues to move into place.
Will the Baby Tooth Fall Out on Its Own, or When Should Parents Be Concerned?
In most, the baby tooth will fall out on its own, given enough time (can take a few months). Once the baby tooth is out, the adult tooth will move forward into better position. Encouraging children to gently wiggle a loose baby tooth (with a clean finger, and/or their tongue!) can often help the natural process along. A dental evaluation may be recommended if the baby tooth shows little or no mobility after the permanent tooth has erupted significantly (taller than the baby tooth), if the child experiences discomfort, or if there are concerns about severe crowding. At that point, a pediatric dentist can determine whether observation is appropriate or whether intervention may be beneficial.
Our Location
