When i used to ride, one of the jobs to do afterwards was to wash the bit and dry it. I used to take lessons with a friend...we were both middle aged no hopers but the lessons were huge fun and the horses got away with murder....we weren’t given school master horses, we were given the ones who ran the kindergarten! Anyway the bits were disgusting after the lesson, covered in slobber which has the consistency of treacle and mixed up with bits of grass.
It was a lovely place to ride. the horses and ponies seemed to enjoy the life too. I never saw one reluctant to be tacked up or to go to the manege. Europe does have a bad rep for using a technique called Rollkur to force the horse to hold his head in a fixed position but Carl Hester has never done it, nor Dujardin, who was his protegee. I think its going out of use in Europe too. It damages the horse’s neck muscles and spine and one thing you want from a dressage horse is longevity as it takes years to get them to the top rank so fitness and good health is essential. If you want to see abused horses, go look at the pleasure and saddle classes in US western riding events :(