About a week ago i noticed my crossbeak was having trouble closing her beak. At 10 mos old it finally grew to where the top and bottom were getting in eachothers way. We have a batter operated dremel sander for the little dogs nails. I like the battery operated because with less power comes less noise and this way it is not so intimidating. So my husband held her and i lightly sanded a bit off the top and bottom til they fit better. There was no struggle.......no pain.......no blood.........and it worked well.