I have just reduced the keyword density by seeing the changes on my keyword ranking.
Now I am very happy to say that I have reached 1st Page on Google for the keyword How to remove dandruff
My blog= Holistic Doctor Online
The changes I have done.
The number of keywords I have removed.
Also removed 2 Tags for which I have not ranked yet.
My blog is just 5 months old and I reached 1st page, So domain age is not important to reach first page.
Also I have very less back links.
In my case only keyword and content did this.
I think this thread will help new bloggers, because I also learned all this methods through forums.
Try reducing one keyword and see the ranking difference for post which has high keyword density.
If you have any queries post on the comment box, friends.