Inlays are similar to fillings. But they are prepared in a laboratory and then adjasted to the tooth with special adhesive.
This process requires minimum two visits to the dentist
During the first visit, the dentist removes the old filling or decay and takes an impression of the tooth. A temporary filling is placed to protect the tooth while the laboratory uses the mould to make the inlay or onlay.
On the second visit, the dentist removes the temporary filling and fixes the inlay or onlay. Inlays are very strong and even last longer than the fillings.