This tool, located on Tools Menu > Show Map Editing Tools > Advanced Tools > Cleanup and Conversion Tools, will scan a layer and fix any conditions where two adjacent areas on the same layer do not exactly align with each other.

Select this tool from the Cleanup and Conversion Tool menu. Users will be prompted to select a layer and specify a tolerance distance. This distance determines how close two adjacent boundaries must be before Think GIS assumes that they should match exactly. In those cases, Think GIS will conform the geometry of both areas to be exactly the same for the common portion of their borders.