Parents often ask about fillings and sealants when their child’s first permanent molars come in, and the confusion is completely understandable. You’re sitting in the dental chair at your child’s checkup, nodding along as the dentist explains that your seven-year-old’s new molars are ready for sealants. You say yes, schedule the appointment, and walk out to the parking lot thinking: wait, what exactly did I just agree to? And is that the same thing as a filling, or something completely different?
Sealants and fillings are two of the most common dental treatments for children, yet most parents leave the office without a clear picture of how they differ or when each one is actually needed. At LaBry Family Dentistry in Broussard, this question comes up all the time, especially when a child’s first permanent molars start coming in around age six. It’s not a gap in parenting, it’s a gap in how dental information typically gets communicated. This article closes that gap.
By the time you finish reading, you’ll understand what each treatment does, when your child’s dentist would choose one over the other, what the procedures actually involve, and what to expect when it comes to cost and insurance. You’ll also walk away with specific questions to bring to your child’s next appointment.
What dental sealants are and why molars need them most
The groove problem hiding in your child’s back teeth
Run your tongue across the top of a back molar and you’ll feel a rough terrain of ridges and valleys. Those valleys are called pits and fissures, and in children’s permanent molars, they can be surprisingly deep. The problem is that even the most diligent brushing can’t reach all the way into those grooves. Toothbrush bristles simply don’t fit.
Food particles and bacteria settle into those tight spaces and stay there, producing acids that slowly dissolve the enamel underneath. This is where the majority of childhood cavities actually develop, not between teeth, not on smooth surfaces, but in the chewing surfaces of the back teeth. A pit-and-fissure sealant addresses this directly by painting a thin protective coating over those grooves and physically sealing them off from bacteria and food. For a plain-language overview of what dental sealants do and how they protect teeth, see what dental sealants are.
How the application works (and why it’s not a big deal)
The sealant procedure is genuinely straightforward, and most children handle it without any trouble. The tooth is cleaned, a mild conditioning gel is applied briefly to prepare the surface, and then the liquid sealant is painted directly into the grooves. A small curing light hardens it in seconds. No drilling, no numbing, no anxiety-inducing equipment. The whole process for one tooth takes just a few minutes.
Timing matters here because there’s a real window of opportunity. First permanent molars typically erupt around age six, and second molars come in around age twelve. Placing sealants shortly after those teeth break through the gumline gives them the strongest possible protection during the years when cavity risk is highest. Once in place and properly maintained, sealants can last five to ten years, though your dentist will check them at every routine visit and reapply if any area has chipped or worn down. Professional organizations publish clinical recommendations for sealant use; for example, see the AAPD’s guidelines for sealants for additional technical detail: AAPD clinical sealant guidelines.
The real difference between fillings and sealants
Sealants protect healthy teeth; fillings repair damaged ones
This is the core distinction, and once you understand it, everything else falls into place. Sealants belong to preventive dentistry. They go onto a tooth that has no decay yet, acting as a shield to stop cavities from forming in the first place. Fillings belong to restorative dentistry. By the time a filling is needed, decay has already broken through the enamel, and the damaged tooth structure has to be removed and replaced.
Think of it this way: a sealant closes the door before a problem walks in. A filling fixes the damage after the problem already got through. Both are valuable, but the circumstances that call for each one are completely different. A dentist cannot use a sealant to treat an existing cavity. A filling is not a substitute for protecting a healthy molar.
Why the timing of a sealant matters so much for kids
Sealants only work on intact, healthy tooth surfaces. Once decay begins forming in those grooves, the window for placing a sealant on that area closes, because once decay starts in those grooves, the sealant window on that surface is gone. This is why dentists bring up sealants proactively at checkups for children between the ages of six and fourteen, rather than waiting to see whether a cavity develops.
At LaBry Family Dentistry, both the need for sealants on healthy molars and the presence of any early decay are evaluated at the same appointment. Families in Broussard and the greater Lafayette Parish area don’t have to guess which treatment their child needs or schedule a separate consultation. The assessment happens right there, during the regular checkup.
Types of tooth fillings and what they mean for your child
Composite and amalgam: the two most common options
Composite fillings are tooth-colored resin that bonds directly to the tooth surface, making them the standard choice for visible teeth and a popular option for back molars as well. They typically last five to ten years and require no special aftercare beyond regular brushing and flossing. Most practices now use composite as the default for children.
Amalgam fillings are silver-colored and have been used in dentistry for more than a century. They hold up well under heavy chewing pressure, and their lifespan often exceeds ten to fifteen years, which makes them a durable option for back molars. Parents sometimes ask about the mercury content in amalgam. Both the FDA and the American Dental Association consider amalgam safe for most patients, but many practices now choose composite for children as a standard of care.
Glass ionomer: a pediatric-friendly alternative
Glass ionomer fillings are less commonly used but have a distinct advantage in pediatric dentistry: they release fluoride over time, which actively helps strengthen the surrounding tooth structure even after placement. This makes them useful for smaller cavities, baby teeth, or situations where ongoing fluoride exposure adds meaningful benefit.
Their trade-off is durability. Glass ionomer typically lasts five years or less, and it doesn’t hold up as well under the grinding forces of back molars compared to composite or amalgam. Your dentist will recommend this material in specific clinical situations rather than as a default choice, so it’s worth asking about if your child has a small cavity on a primary tooth or a particularly high-risk tooth.
Can sealants and fillings be used on the same tooth?
The clinical rules dentists follow
The short answer is: sometimes, but it depends on the specific situation. Sealants are designed for sound, intact enamel. Their entire purpose is to protect tooth surfaces that have not yet decayed, so applying a sealant over active cavities or badly broken-down tooth structure doesn’t work and isn’t done.
That said, if a child has a small existing filling on one section of a molar and the remaining grooves on that same tooth are still healthy, a dentist may apply a sealant to the unfilled portions of the surface, as long as the filling is intact and not leaking. The clinical judgment belongs to the dentist. If the tooth is already heavily restored, adding a sealant offers little additional benefit and most dentists won’t recommend it.
What this means for your child’s treatment plan
When weighing fillings and sealants on the same tooth, the filling always comes first. Once the tooth is restored and has healed properly, the dentist can then assess whether the remaining fissures on that tooth still make sense to seal. Parents should not assume that a sealant makes ongoing monitoring of a filling unnecessary. The two treatments serve different functions, and neither replaces the other.
The practical takeaway is simple: keep up with your child’s routine checkups. Early detection of decay means a smaller filling when one is needed, and a smaller filling means more healthy tooth structure preserved for the long term.
What fillings and sealants cost and how insurance usually handles both
Typical out-of-pocket ranges in 2026
Dental fillings in the U.S. typically run between $100 and $400 per tooth without insurance, depending on material and the size of the cavity. With a dental plan, most insurers classify fillings as basic restorative care and cover roughly 50 to 80 percent of the allowed fee after your deductible. Your out-of-pocket share will depend on your specific plan’s annual maximum and cost-sharing structure. For typical filling cost ranges and financing options, see dental fillings cost and financing.
Sealants are significantly more affordable than fillings, with average costs in 2026 falling around $33 to $82 per tooth before insurance. Most dental insurance plans cover sealants as a preventive service, often at or near 100 percent for children and adolescents, though age limits and per-tooth caps vary by plan. If you’re investigating typical coverage rules for sealants under dental plans, a good consumer-facing overview is available from insurers like Humana’s dental sealants resource. The financial case for fillings and sealants breaks down simply: one sealant applied today can protect a molar for up to ten years at a fraction of what a filling would cost if that same tooth developed a cavity instead.
Getting both services without a separate specialist visit
A common concern among parents is whether sealants require a visit to a pediatric dental specialist while fillings are handled by a general dentist. For most healthy children, the answer is no. A family dentist with experience in children’s care can place sealants, identify early decay, and restore teeth with fillings, all in the same practice.
At LaBry Family Dentistry in Broussard, both preventive sealants and restorative fillings are available for patients of all ages. Families throughout Broussard, Youngsville, Scott, and greater Lafayette Parish can have their child evaluated and treated at the same practice, without coordinating between multiple offices or navigating specialist referrals. For more about the services we offer, see our Fillings and Sealants page.
What to do with this information at your child’s next appointment
The key distinction to carry with you is this: sealants are a proactive shield placed on healthy molars before decay ever starts, and fillings are the repair option after decay has already done damage. Understanding fillings and sealants means you can have a more informed conversation with your child’s dentist rather than nodding along and wondering later.
The timing message is equally important. The window for placing sealants is widest right after permanent molars erupt, around ages six and twelve. The longer you wait after those teeth come in, the more exposure time those unprotected grooves accumulate. Acting early is always the easier path.
Bring these questions to your child’s next appointment:
- Have you checked whether my child’s molars are candidates for sealants?
- Are any of those grooves already showing early signs of decay that would change the recommendation?
- Does my insurance cover sealants as a preventive service, and are there any age or tooth restrictions I should know about?
Those questions will give you everything you need to make a confident decision about your child’s care. For practical at-home steps to reduce cavity risk between visits, read How to Prevent Cavities in Children at Home.
If you’re a parent in the Broussard area looking for a practice that handles both preventive sealants and restorative care for your whole family under one roof, LaBry Family Dentistry is worth a call. New patient appointments are available, and the team is used to answering exactly these kinds of questions. If you’re evaluating practices, you may also find it helpful to review 8 Questions to Ask Before Choosing a Family Dentist for Kids before your visit.
