Onlays vs. Fillings: What’s the Difference?

If you’ve ever had a cavity, chances are your dentist mentioned either a filling or an onlay. At first glance, they might sound interchangeable—but they’re not! At David C. Wood Family & Cosmetic Dentistry, we want you to feel informed and confident about your restorative dental treatment options. Let’s break down the differences between so you’ll know exactly what to expect when it comes time to repair your smile.

What Is a Filling?

A tooth filling is the most common treatment for cavities, especially small to medium ones. We start by removing the decayed portion of the tooth and replacing it with a tooth-colored composite resin. Fillings are quick, cost-effective, and blend seamlessly with your natural teeth. They’re the go-to option for everyday cavities and are usually completed in just one appointment.

What Is an Onlay?

Onlays are a more advanced restoration designed for larger cavities or more extensive damage to your chewing teeth. Sometimes called “partial crowns,” onlays cover one or more cusps (the pointed chewing surfaces) of a tooth. They’re custom-made in a lab, usually from porcelain or composite resin, and bonded into place for a precise fit. Onlays not only restore the tooth but also add significant strength, making them ideal when a simple filling isn’t strong enough.

Which Option Is Right for You?

The choice between an onlay and a filling depends on the size and location of the cavity. Small cavities are typically best treated with a filling, while larger ones that affect the chewing surface may require the durability of an onlay. During your visit, we’ll examine your tooth, explain the pros and cons of each option, and recommend the best treatment to protect your long-term dental health. 

Why Does Restoration Matter?

Both onlays and fillings play a crucial role in halting decay and preventing future damage. When cavities go untreated, they can spread, weaken your tooth, and even lead to infection. Restorations like these allow you to chew comfortably, maintain a healthy bite, and keep your smile looking great for years to come.

Ready to Smile with Confidence?

Whether you get a filling or an onlay, the goal is the same—to restore your tooth and prevent further damage. Both treatments help you chew comfortably, maintain your smile, and stop decay from spreading. We also offer additional treatments like periodontal therapy, implant dentistry, and TMJ disorder treatment to keep your entire mouth healthy.

Ready to take care of that cavity or just want to stay on top of your oral health? Request your appointment with David C. Wood Family & Cosmetic Dentistry at our Carmel, IN, office today at (317) 844-0592.