What to Do When a Child’s Baby Tooth Doesn’t Fall Out but a Permanent Tooth Is Already Emerging

It’s not uncommon for parents to notice that a child’s permanent tooth is beginning to erupt while the corresponding primary (baby) tooth remains firmly in place—a phenomenon often referred to as “shark teeth.” This occurs most frequently in the lower front teeth, where the permanent incisor emerges behind the still-intact primary incisor, creating a temporary double row of teeth.

This situation typically arises when the root resorption of the primary tooth is delayed or incomplete, preventing natural exfoliation. While it may appear alarming, shark teeth are generally benign and self-resolving in many cases—especially if the primary tooth becomes sufficiently loose within a few weeks. Encouraging gentle wiggling of the baby tooth can help accelerate physiological shedding.

However, intervention may be warranted if the primary tooth shows no mobility after four to six weeks, or if crowding, malpositioning, or functional interference (e.g., difficulty chewing or speech articulation) develops. In such instances, a pediatric dentist will assess factors including root resorption status via radiography, arch space availability, and occlusal relationships before determining whether extraction of the retained primary tooth is indicated.

Early evaluation is recommended—not only to guide timely management but also to rule out less common underlying contributors, such as dental anomalies, local inflammation, or systemic conditions affecting tooth development or turnover. With appropriate monitoring and, when necessary, conservative intervention, outcomes are overwhelmingly favorable, and long-term dental alignment is rarely compromised.