Lippage is a condition where edges of the tiles or slabs
are not at the same level with each other. A one way to determine this
is by a thickness of dime when placing it to the edge of next
tile and if the next tile is higher than the dime this can be considered
lippage.
Before polishing marble floor any tile lippage should
be removed and the surface made flat.
The best way for removing lippage is grinding down the
floor by lippage removal discs to complete remove or reduce the tile
lippage.