In a short article I am not going to go into detail about how to use the Pessoa Training Aid. What I do know is that it is invaluable in the work I do for both rehabilitating horses but also backing/starting and rebacking horses. As with any tool it is only as good as the person using it and, yes, used incorrrectly you can cause damage to your horse. But the same could be said of any aspect of horse-riding from the saddle to the rider's hands and other aids. Here's a link to a short article by Sue Dyson being positive about the Pessoa. What I would say, if you want to use one, have lessons from a professional first. And secondly, use a leather bit as this is much kinder on the horse's mouth should it spook at something whilst in the Pessoa. Good luck and happy training! Pleaes call or message me if you want any further advice or information on its use.