Content freshness is good.
It may be temporary, or you may have accidentally diluted the effect of some keywords or removed some content integral to the page without realising.
Hi Niceman
From past experience this may be only a temporary decrease is position.
Before i did a website revamp on a site i used to own (kiddiekids-co-uk) it was always sitting on page 2 of google for the search term "baby names". When i updated the page with new content and design i noticed the page fell to the middle of page 3 for the same search term. After 2 or 3 weeks it had moved back upto the top of page 2 with the odd position on the bottom of page 1.
It now shows around the middle of page one for that search term.
My advice would be to give it a little bit of time to stabalize in the search engine positions for the new content.
Lee
If you have even 10 years older page but if you change the keyword dentistry or changes in title and contents then this may harm your PR. Try to increase the content and do not less the words that are keywords.
I totally agree with khuram. Chances are you have edited the "word" or "phrase" that drives traffic to your site. And also once you have edited and added contents, there's a good chance that your keyword density will go up or go down. The recommended keyword density is 3-5%.
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