In cases where filling is not suitable, inlays and onlays are applied for aesthetic treatment as a solution among coating and filling.
Inlay and Onlay is applied by sticking the relevant filling in the gaps after the measurement taken from the patient. They are preferred over veneers in order to prevent excessive material loss in the teeth.
Inlay/onlays lasts about 10-15 years. Onlays have a shorter lifespan than inlays because they can be more difficult to attach to teeth. They wear and tear much more than inlays. But with regular maintenance and repair, you can make them last longer.