Why does my keyboard light flashes sometimes?

I own a white square good old macbook, not a macbook pro. I believe this was released on early 2009. I see light flashes under the keys every now and then. From what I have read, this model was not supposed to light at all,  Is it dangerous? could it be somehow dusty or damaged under the keys?

Try resetting SMC.     Apple support article mentions that.
http://support.apple.com/kb/HT3964
Choose the appropriate proceedure for your MBP.
Please read "Additional Information".
Best.

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