You want your keyword density to be between 2% and 4%. If you get much above 4%, the search engines will think you’re just trying to SPAM the article and penalize it. If you get much below 2%, the search engines won’t think it’s very relevant and tend to ignore it. You also MUST be sure that the keyword phrase is used in a natural way in each and every instance. You can check this by reading them out loud to yourself.

