<prompt> Approach to Caldwell Luc operation is ?Hard palateSublabial sulcusInferior metusSuperior meatus  <response>: Ans. isbi.e., Sublabial sulcusRel Dhingra Shep. 422Caldwell-Luc operation is a process of opening the maxillary antrum through canine fossa by sublabial approach and dealing with the pathology inside the antrum. 