oh, i forgot to say that what i did is to put a sandpaper on the ramp that connects the 1st and 2nd floor of my bunny's cage, so that everytime he runs up and down, he will trim the nails naturally. i've had it on for a few weeks now, and it does seem to work. i do still need to clip them from time to time, but i would say not as often.
thisfrees me from the bad feelings of accidentally cutting into his quick, because even that can hurt! not to mention declawing, that will be absolutely painful to the bun!