I've found 4 of them on the floor this week. I'm pretty sure they are from one kitty judging by the coloring. Cats shed whiskers but what is the rate of shedding. I'm worried that she will lose whiskers faster than she can replace them!
What breed is your kitten? breeds such as the selkirk, devon and cornish rex grow whiskers but due to their build they sorta snap off (so I've read). So perhaps it's just the build of your kitty?
I'd say if he seems healthy and his usual self it's nothing to worry about but I'd probably get a second opinion, its not some thing I know too much about.