Porcelain onlays can last 10 to 15 years with a proper oral health regimen. For long-lasting results, it’s important to brush at least twice a day, floss daily, and avoid certain types of staining foods and beverages. The great thing about onlays is that they’re durable and built to last during your normal day-to-day life. During your biannual visit to our practice, your dentist will be able to determine whether your restoration would need to be replaced.