If your child's exam turned up a cavity, the fix is usually simpler than parents expect: one visit, a tooth-colored filling, and a tooth that looks like nothing ever happened. At NOVA Pediatric Dentistry & Orthodontics, Dr. Woo uses composite resin, a BPA-free, tooth-colored material made from a blend of fine glass particles and acrylic resin, to restore the tooth. Unlike older silver amalgam fillings that just sat in a prepared hole, composite actually bonds to the tooth's surface, both the hard outer enamel and the softer layer underneath called dentin.
Cavities in kids are common, and finding one doesn't mean you did anything wrong. It often just means your child has the biology most kids have. Baby teeth have much thinner enamel than adult teeth, which makes them more vulnerable to decay even when your child brushes well. The deep ridges and pits on the back molars are also easy spots for food and bacteria to hide, and a small toothbrush can't always reach them. What matters most right now is catching the decay while it's still in the outer part of the tooth, before it works its way down to the nerve.
Questions, or ready to get your child on the schedule? Call our Ashburn office at (703) 729-7005 or request an appointment online.

Before anything happens, we walk you through what the exam found. We'll pull up the X-ray and show you the tooth so you can see exactly what we're talking about. Your child gets settled in the chair, and we explain what they're going to feel and hear, in words that actually make sense to a kid, not dental jargon.
We start with a numbing gel on the gum so the area is already dulled before the local anesthetic goes in. We're honest with kids about what they'll feel: a little pinch, and then a funny, puffy, sleepy feeling in their lip, like it fell asleep. Your child can squeeze a hand, raise a finger to pause, or ask for a break at any point.
Once the tooth is numb, we remove the decayed part and clean up the area so the filling material has a good surface to hold onto. Because tooth-colored composite actually bonds to the tooth, almost like an adhesive, we don't have to remove as much healthy tooth structure as older silver fillings required.
The composite resin goes in as a soft, putty-like material that we shape to match the natural contours of the tooth. Then a small blue curing light hardens it, and each layer sets in just a few seconds. Kids almost always think this part is the coolest thing they've seen at a dentist's office.
Your child bites down so we can check that nothing feels off or uneven. We make any small adjustments, then polish the filling smooth. And that's it: one visit, fully done, no temporary filling to worry about at home and no second appointment needed.

Composite is fully hardened before your child leaves, so there's no waiting period. Mild sensitivity to cold or pressure for a few days is normal and fades on its own. Brush twice a day, floss between the back teeth where cavities start, and keep six-month cleanings so we can watch the filling and the teeth around it.
What a filling costs depends on how many teeth are involved and how many surfaces of each tooth have decay, and of course, what your dental plan actually covers. Most plans cover tooth-colored fillings, but some cover them at the same rate as older silver fillings. If there's a difference in cost, that gap becomes your out-of-pocket. Your deductible and annual maximum play into it too, which is why the number looks different for every family.
We don't want you guessing. Our front team at NOVA Pediatric Dentistry & Orthodontics checks your benefits before the appointment and goes over what you can expect to pay, so you're agreeing to a real number, not an estimate you find out was wrong at checkout. We accept cash, checks, Visa, MasterCard, and Discover, and we offer CareCredit financing if you'd rather spread out the cost. It's the same option we offer families working through a bigger treatment plan like braces or Invisalign.

Dr. Woo opened NOVA in January 2006, right out of her residency at Children's Hospital Boston. Twenty years later, we're seeing the kids of kids we treated back then, which tells you something about what keeps families coming back.
Families come to us from all over Ashburn and Loudoun County, and the thing we hear most is that nobody rushed their child. That is not an accident. It is just how we work.
Yes. Composite resin has been used safely in pediatric dentistry for decades. It contains no mercury, bonds directly to the tooth rather than sitting in a hollowed-out space, and lets us preserve more healthy tooth structure than older silver fillings.
Because decay does not wait. Left untreated, a cavity can reach the nerve, cause pain or infection, and affect the permanent tooth forming underneath. Baby molars also stay in place until age ten or twelve, so a filling protects years of chewing and holds space for the adult tooth coming in behind it.
Not once the tooth is numb. Most kids feel pressure and mild vibration, not pain. We tell children exactly what to expect at each step and give them a clear way to signal us if they need a break. If something hurts, we stop before moving on.
It varies based on the size of the filling, where the tooth sits in the bite, and how well your child brushes at home. On a baby tooth, the goal is keeping it comfortable and functional until it falls out naturally. We check every filling at each routine cleaning.
The filling is fully hardened before you leave. The only reason to wait is the numbness, which takes one to two hours to wear off. A numb lip or cheek is easy to bite without noticing. Once the feeling returns, normal eating is fine. Avoid very hard or crunchy foods for the rest of that day.
A cavity is a small problem when it's handled early, and a bigger one when it waits. At NOVA Pediatric Dentistry & Orthodontics, Dr. Woo will walk you through what we found, what we recommend, and what it costs, and we'll take good care of your kid while we're at it.
Call us at (703) 729-7005 or request an appointment. We're at 21785 Filigree Court, Suite 208 in Ashburn, open Monday through Friday, with 7:30 a.m. starts on Mondays, Wednesdays, and Fridays. We offer pediatric dentistry and orthodontic care under one roof.
Please call (703) 729-7005 or request an appointment online to set up your first visit. We’ll be in touch soon.