When getting inlay or onlay placed in would the doctor shave ou only the filling that needs to be replaced or with some of the tooth structure too?

Inlay prep: Conservative tooth preparation and less complicated cavity design. The dentist will remove any decay and/or old filling materials only. Good choice and good luck.

Tooth preparation: When preparing a tooth for an conservative inlay or onlay the dentist will remove the decay and weakened tooth structure. This will leave sound tooth structure to bond the inlay or onlay to.

Yes: The straight answer, is yes you have to remove the old filling and shave off any decay around the cavity to reach a clean surface and remove additional tooth structure to properly design and fabricate the new piece.hope this helps.