Kids lose their baby teeth because permanent teeth growing underneath gradually dissolve the roots holding baby teeth in place. This process typically starts around age 6, though some children don’t lose their first tooth until age 7. By the time a baby tooth feels wiggly, most of its root has already been broken down, leaving little anchoring it to the jaw.
How the Body Dissolves Baby Tooth Roots
The process behind losing a baby tooth is more sophisticated than most people realize. It isn’t simply a bigger tooth pushing a smaller one out. Instead, the body deploys specialized cells called odontoclasts that actively break down the root of the baby tooth from the outside in. These cells work much like the bone-remodeling cells used throughout the skeleton, and they’re activated by a signaling system between cells in the tissue surrounding the tooth root.
When a permanent tooth begins moving upward through the jawbone, the pressure it creates triggers cells in the surrounding ligament to release inflammatory signals. Those signals recruit and activate the root-dissolving cells, which latch onto the root surface and eat it away over weeks to months. At the same time, cells inside the tooth’s pulp (the soft tissue at the core) undergo a programmed self-destruction process, clearing out the living tissue from the inside. By the time your child notices a tooth is loose, the root that once extended deep into the jawbone has been almost entirely absorbed. What falls out is really just the crown and a tiny stub.
The Order Teeth Fall Out
Baby teeth generally fall out in the same order they arrived. The two bottom front teeth (lower central incisors) go first, usually around age 6. The two top front teeth follow shortly after. From there, the pattern moves outward and backward:
- Lower and upper central incisors: roughly ages 6 to 7
- Lateral incisors (the teeth flanking the front two): roughly ages 7 to 8
- First molars: roughly ages 9 to 11
- Canines: roughly ages 9 to 12
- Second molars: roughly ages 10 to 12
That means the full transition from baby teeth to adult teeth spans about six years. Most children have all their permanent teeth (except wisdom teeth) by age 12 or 13. The timeline varies from child to child, and girls tend to lose teeth slightly earlier than boys. If your child hasn’t lost any teeth by age 7, it’s worth mentioning at a dental checkup, but a delay of several months to a year is common and rarely signals a problem.
When Permanent Teeth Come In Behind Baby Teeth
Sometimes a permanent tooth pokes through the gum before the baby tooth has fallen out, creating a double row that parents often call “shark teeth.” This looks alarming but is surprisingly common, especially with the lower front teeth. It happens for a few reasons. The baby tooth root may not be dissolving on schedule, so the permanent tooth takes a slightly different path upward and emerges behind or in front of the baby tooth rather than directly underneath it. In other cases, the child’s jaw simply hasn’t grown enough to provide space, so the new tooth finds the path of least resistance.
In most shark-teeth situations, the baby tooth loosens and falls out on its own within a few weeks once the permanent tooth is partially erupted. The tongue naturally pushes against the new tooth, which helps nudge the baby tooth forward and out. If the baby tooth stays firmly rooted for more than two to three months after the permanent tooth appears, a dentist can remove it to let the adult tooth drift into its correct position.
Handling a Loose Tooth at Home
The old doorknob-and-string approach is best left to movies. Pulling a tooth before it’s truly ready can damage the root (if any remains), hurt the surrounding gum tissue, and cause unnecessary bleeding and pain. The simplest approach is to let the tooth come out on its own. Kids are naturally drawn to wiggling a loose tooth with their tongue or fingers, and gentle wiggling is fine. It actually helps the last fibers release.
If a tooth is hanging by a thread and clearly ready, you can fold a clean piece of tissue over it and squeeze gently. A tooth that’s truly ready will pop out with almost no resistance. If you feel any real tug, stop and give it more time.
What to Do After a Tooth Falls Out
A little bleeding from the empty socket is completely normal. Have your child bite down on a small piece of clean, damp gauze or a moistened washcloth for a few minutes. The pressure stops the bleeding quickly. Cold water or a popsicle can help with any minor discomfort and also constricts blood vessels in the area.
The socket typically closes over within a day or two. During that window, soft foods and lukewarm drinks are more comfortable. Your child can brush normally but should be gentle around the gap. There’s no need for salt rinses or special mouthwash unless a dentist recommends it. If bleeding hasn’t stopped after 15 to 20 minutes of steady pressure, or if the area looks swollen or infected in the days following, a call to the dentist is a good idea.
Why Baby Teeth Matter Even Though They Fall Out
It’s tempting to treat baby teeth as disposable since they’re temporary, but they serve several important roles during the years they’re in place. They hold space in the jaw for the permanent teeth developing below. When a baby tooth is lost too early due to decay or injury, neighboring teeth can drift into the gap, crowding the permanent tooth and potentially leading to alignment problems later. Baby teeth also help children chew, speak clearly, and develop normal facial structure during critical growth years.
Keeping baby teeth healthy until they’re ready to fall out naturally gives permanent teeth the best chance of coming in straight and in the right position. That means brushing twice a day with fluoride toothpaste, even for teeth that will eventually end up under a pillow.