With proper care, most inlays and onlays last 10 to 30 years. Porcelain restorations typically reach 20 to 30 years. Gold is the most durable option at 30 years or more. Composite inlays and onlays average 10 to 15 years. Material and oral hygiene are the two biggest factors.
Inlays and onlays outlast direct composite fillings by a significant margin. A standard filling typically needs replacing every 5 to 10 years. A well-maintained inlay or onlay can last two to three times longer. That longevity is one of the main reasons they’re worth considering when damage is beyond what a simple filling can handle well.
Key Takeaways
- Porcelain inlays and onlays typically last 20 to 30 years with proper care
- Gold is the most durable dental material — 30 years or more
- Good oral hygiene, avoiding hard foods, and regular check-ups are the main factors in longevity
Lifespan by Material
Material is the single biggest variable in how long an inlay or onlay lasts.
| Material | Typical lifespan | Notes |
|---|---|---|
| Composite resin | 10 to 15 years | Most affordable. Can stain over time. Shorter lifespan than porcelain. |
| Porcelain (ceramic) | 20 to 30 years | Most commonly placed. Excellent strength. Natural tooth color match. |
| Gold | 30+ years | Longest-lasting option. Some prefer it for back molars where durability outweighs aesthetics. |
The material your provider recommends depends on the tooth’s location, how much chewing force it handles, and your aesthetic goals. Back molars are candidates for gold or porcelain. Teeth more visible when you smile almost always call for porcelain.
What Shortens Their Lifespan
Teeth grinding (bruxism). Clenching and grinding during sleep places excessive force on inlays and onlays over time. A nightguard significantly extends the life of any restoration. If you grind and don’t have a nightguard, that’s the first conversation to have.
Hard foods and habits. Chewing ice, biting fingernails, or using your teeth as tools can chip or crack any dental material. Porcelain is strong but not indestructible.
Poor oral hygiene. The restoration itself can’t decay, but the tooth underneath it can. If bacteria reach under the margins, new cavities can develop and compromise the fit. Daily brushing and flossing are what prevent this.
Missed check-ups. Regular dental visits allow early detection of wear, cracks, or failing margins before the restoration fails completely. Caught early, replacement is straightforward. Caught late, the underlying damage is usually more extensive.
How Do You Know When One Needs Replacing?
Signs that an inlay or onlay may need replacement include sensitivity to hot, cold, or pressure; visible cracks or chips; a rough or uneven bite; or decay detected under the restoration margin on an X-ray. Regular dental check-ups are the most reliable way to catch these issues before they become larger problems.
Inlays and onlays don’t announce when they’re failing. They wear gradually. Regular X-rays and visual checks during routine exams are what catch the early signs. When a restoration is flagged and replaced before it fails, the underlying tooth is usually intact and easily re-restored. When it’s left until something breaks or sensitivity becomes significant, there’s often more going on.
If it’s been a while since your last check-up or you have an existing inlay or onlay that feels different than it used to, schedule your appointment at our Edmonds office and we’ll take a look.
