How safe is an air blaster/high pressure air to clean under the keyboard?

how safe is an air blaster/high pressure air to clean the stuff under the keyboard? ive heard those things can be dangerous. any ideas?
if you recommend it, how do you use it safely? which brand do you suggest?
please advise. thanks.
Macbook Pro   Mac OS X (10.4.8)  

This was standard procedure at the computer lab at my college. Just make sure to use compressed air cans designed for photographic and/or electronic use.
Put the extension tube on the can. Holding the keyboard/laptop at an angle, insert the nozzle between each of the rows of keys and give it a few short blasts. Debris will be blown out of the opposite end of the keyboard.
Make sure not to hold the can on its side or upside down when you do this, because the propellant in the cans can come out as a liquid and may leave a residue.
I still do this routinely with my systems, and have never had a problem. My oldest laptop is now seven years old and has not suffered any ill effects. We did this weekly at the computer lab.
My main problem at home is cat hair, which is easily removed by this method; friends of mine with beards say it also works for the occasional errant whisker. Cleaning keyboards at the lab in this manner dislodged all kinds of nasty bits, quite often including Doritos...
Ned, this actually does work pretty well. Worst case, it just blows the larger/heavier debris to one end of the keyboard, where it can be more easily tapped out.

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