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(Tooth) Decay Detection: How to Tell If You Need a Dental Filling

January 7, 2026

Filed under: Uncategorized — drsmiley @ 10:35 am
A closeup of a bearded man receiving a dental filling

At this point, maybe you don’t need to be “sold” on dental fillings. You already know (and trust) that they help at-risk teeth effectively. On the contrary, it’s whether you need them that still bothers you. There’s no reason to worry in this case; your Waverly dentist can help you. Just keep reading to see if you need a dental filling, as well as which kind (if any) would suit your smile best.

Remind Me: What are Dental Fillings?

For the sake of context, you should first review what dental fillings are. Only then will you understand the signs that you need them.

All dental fillings are mixtures of materials that fix damaged teeth. As such, their primary role is to fill the cavities (i.e., holes) left by tooth decay and prevent further harm to your smile. They make previously weak teeth sturdier when placed and protect treatment sites from “bad” bacteria and food debris.

Today’s fillings come in one of two types: amalgam or composite. If you receive the first kind, they’ll be silver in color and contain mercury mixed with silver, tin, or zinc. Composite fillings, meanwhile, are tooth-colored and use a resin base with powdered quartz and glass.

How to Tell If You Need a Filling

Should you need a dental filling, your smile will likely show several notable symptoms. These include the following:

  • An Aching Tooth – If you suffer from a toothache, you may have a cavity. The latter would require a dental filling for treatment.
  • Tooth Sensitivity – Decayed teeth often feel sensitive to certain foods and extreme temperatures.
  • A Tooth with a Dark Spot – When a tooth has a dark spot, it’s almost always decayed and in need of a filling.
  • Prior Dental Damage – To be honest, most teeth with chips, cracks, and other damage can only be repaired with fillings.

Finding the Best Filling(s) for You

Though amalgam and composite fillings are different, neither is universally “better” than the other. The best kind for you will depend on your situation.

Indeed, the different types of fillings suit varying needs. The amalgam kind can work better for patients with tight budgets; they tend to run cheaper over time. On the other hand, composite fillings are ideal when you want seamless results that blend with your smile. You’ll just have to pay a bit more to achieve those great looks.

Aside from the points above, consult your dental provider to see if you need a dental filling. They can assess your smile to find out for sure!

About the Practice

Smiley Family Dentistry is based in Waverly, IA. Led by Dr. Jonathan Smiley himself, our practice aims to do everything possible to enhance your smile. We thus offer preventive, cosmetic, and even restorative services, as well as same-day dental emergency care. Whether your grin needs a standard checkup or full-on dental implants, our team is ready and eager to assist! For more details or to book a visit, please contact us on our website or by phone at (319)-352-2270.