Using a keyword research tool is obviously important for you to know how many times your keyword is showing inside the body of your text. Once you have the info about your own content from the keyword density tool you begin to systematically rip apart your competitors by going to your research tool for the coup de gras. Your keyword density tool will provide you with the optimal number of times in your copy that keyword appears and make sure you are not spamming the system. While mentioning enough times your keyword, mentioning that keyword too much will turn off the user and thereby the king of search, the mighty Google. The keyword density tools you find for free online should be enough to keep you straight.