A cavity diagnosis can feel like it comes with an automatic answer, but there’s actually more decision-making involved than most people realize — starting with what the filling is made of, and whether a filling is even the right fix. This tooth fillings buyer’s guide McKinney is meant to help you understand those choices before your next appointment.
Composite vs. Amalgam: Comparing Filling Materials
Composite (tooth-colored) fillings are made from a resin material that’s shaded to match your natural tooth, then bonded directly to the treated area. Because they blend in, they’re the material most patients choose today, especially for cavities in visible areas like the front teeth or the sides of back teeth.
Amalgam (silver) fillings are a metal alloy that has been used in dentistry for a very long time and has a long track record for durability, particularly in the back molars where chewing forces are highest. They’re generally less expensive than composite but are noticeably visible against natural tooth color.
Many dental practices, including ours, primarily use composite for most patients today, though the right material can still depend on the location and size of the cavity, your bite, and your own preference. Your dentist will talk through which makes sense for your specific tooth.
When a Filling Is Enough — and When It Isn’t
A filling works well when the decay is limited and there’s still enough healthy tooth structure remaining to support it. In these cases, a filling can restore the tooth in a single visit and hold up well for years.
When decay is more extensive, or when a large portion of the tooth has already broken down, a filling may not have enough healthy structure to bond to securely — and packing in a filling that’s too large for the remaining tooth can actually make the tooth more prone to cracking later on. In these situations, a crown, which covers and protects the entire visible tooth, is often the more durable choice.
As a rough guide, if more than roughly a third to half of the tooth’s chewing surface is compromised, or if the tooth has had a root canal, a crown is frequently the safer long-term option. Your dentist will make this call based on an exam and X-rays, not guesswork — if you’re ever unsure why a filling versus a crown was recommended, it’s always fair to ask.
There’s also a middle ground worth knowing about: an inlay or onlay, which is a lab-made filling that covers more of the tooth than a standard filling but less than a full crown. Your dentist might suggest this option when a cavity is too large for a simple filling but the tooth still has enough healthy structure that a full crown feels like more than is needed.
What Getting a Filling Actually Involves
A standard filling appointment is usually straightforward and completed in a single visit. The area is typically numbed first, the decayed portion of the tooth is removed, and the tooth is cleaned out before the filling material is placed and shaped to match your natural bite.
For a composite filling, the material is applied in layers and hardened with a special curing light between layers, then polished so it blends smoothly with the surrounding tooth. Most patients are back to normal eating within a couple of hours, once any numbness from the anesthetic wears off.
What Affects the Cost of a Filling
Filling costs typically depend on the material chosen, the number of tooth surfaces involved (a cavity on one surface costs less to fill than one that wraps around several), and the tooth’s location. Back teeth, which take on more chewing force, sometimes call for extra steps to make sure the filling holds up over time.
If a cavity turns out to be deeper than expected once treatment begins, occasionally a different approach, like a crown instead of a filling becomes the better recommendation partway through the visit. Your dentist should talk you through any change in plan before proceeding, and this is a good moment to ask what changed and why.
Many dental insurance plans provide at least partial coverage for fillings as a basic restorative service, though coverage details vary by plan. Our team can help you understand what your specific plan is likely to cover before treatment begins.
How Long Fillings Last
Composite fillings have a solid track record, but like any dental restoration they can wear down or need replacement over time, especially in high-pressure chewing areas. Amalgam fillings tend to hold up for a long time as well, though eventually most fillings of either material reach a point where they need to be replaced or upgraded.
Good oral hygiene, regular checkups, and avoiding habits like chewing ice or using your teeth as tools all help a filling last as long as possible.
Making the Decision With Your Dentist
Ultimately, the choice between filling materials and between a filling and a crown, comes down to your specific tooth, your bite, your budget, and your priorities around appearance versus cost. A thorough exam is the only reliable way to know which path is right for you.
Ready to Take Care of That Cavity?
If you have a cavity you’ve been putting off, don’t wait until it becomes a bigger and more expensive problem.
Learn more on our Fillings page, or request an appointment with our McKinney team to get a clear, personalized recommendation.
