Canna, when the wolf teeth get too pointy they can't chew side to side and the grass/hay starts falling out of their mouth and they get no nourishment....it usually happens to horses after they are about 6....and yes, it is expensive.....they usually give them a shot to semi relax/knock them out, tie them up in the stall, open mouth and insert drill.....pretty barbaric, if you ask me....
I've had horses here now for 14 years and am shocked at veterinary practices in this day and age....one of my baby males was castrated, they whacked the balls off, left them on the ground in the round pen, no sutures, just let it drain, keep the horses on their feet moving, and hope the flies don't infect the site....
Another horse colicked, the vet was here at midnite, shoved a plastic dirty tube through her nose into her stomach and dumped a gallon of mineral oil into the tube...before he left he said, if she's still standing in the morning she'll be fine, if not, call me and I'll swing back to put her down.....what.......?