The thing that i like about the drills is that my boy had some very sharp teeth in the very back of his mouth, that couldn't have been reached with a regular file.
Kiki: It really depends on your area. My vet does it for $45. While some other people have to pay around $170. Just call your vet and ask if they do it and for how much.
Whipple: Yes for most horses they do need to be done. It can result in dropping feed, weight loss, ulcers in their mouth, moodiness, and it can cause your horse not to take the bit due to pain. The horses teeth can get very sharp and uncomfortable if they aren't floated.
"A good rider can hear his horse speak to him. A great rider can hear his horse whisper."