Why my Blog Visitors suddenly popped up so much?

When I opened my Nuffnang account today, I saw the analytics page shown as above. Wow...It's only 7pm there is already 109 visitors....

Then I clicked on the referrals button, the keywords shown as below:

You can see very obviously that TEETH is the main keyword my visitors had searched to come to my blog? Lol! Why teeth? Haha, then only I realized long time ago during November 09, I had blogged about a blog post related to teeth...lolz.

You can see here: http://ickesangelo.blogspot.com/2009/11/i-should-take-care-of-my-teeth-before.html

And most of my visitors came from US, normally majority is from Malaysia.........

Hmm.....combining all the keyword, I went to google teeth in US....and came to this news!

http://www.businessweek.com/lifestyle/content/healthday/648650.html?chan=rss_topStories_ssi_5

U.S. Officials Recommend Reduced Fluoride Levels in Water

Goal is to prevent kids from getting too much, developing spotted teeth, experts say

Haha, I guess that's the reason why my blog has sudden massive increase of visitors from US, lolz!