<prompt> In an anterior tooth to be restored with composite restoration, which of the following regarding the primary resistance form is false?Horizontal pulpal and gingival wallsAll unsupported enamel need not be removedRounding of internal line anglesNone of the above  <response>: Weakened, friable tooth structure always should be removed at this step Primary resistance form in the preparation. Unsupported but not friable enamel may be left for esthetic reasons in anterior teeth, where stresses are minimal and a bonded composite restoration is anticipated.NOTE: Rounding of axiopulpal line angle, rounding of internal line angles and horizontal pulpal and gingival walls are primary resistance forms.Reference: Sturdevant operative dentistry. 7th EDITION, Page No:128 