If you've got a situation where there's a polygon with more or less than three or four sides, the best thing you can do is bring up the statistics window (shortcut key "w")
This might be something you would like to keep open and to one side of the modeller window as it can be quite useful.
If you go to Polygon mode (CTRL+H) then the statistics window will show you how many polygons you have as well as how many points they have. If there are polygons greater than four points then click on the little "+" and those polygons will become selected - from there you can do with them as you wish - correct the mistake or delete them. Same if you have polygons with less than three points.
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