If your client qualifies for expungement (this is rare), the record disappears. It is as if the offense never occurred. The record of the conviction disappears.
Ohio Revised Code section 2151.358 is about Expungement of Sealed Juvenile Court records.
Ohio Revised Code is about 2953.37 Expungement of certain convictions relating to firearms
Ohio Revised Code section 2953.38 is about Expungement of certain crimes for victims of human trafficking