One of the arabian youngsters I have been working with in the last few years turns out to have an allergic reaction on his gums from Monty's sweet iron/copper-bit.
He had some issues about going in frame, tended to keep his head tilted, when asked to work on the bit. The dentist found an inflamation around the bars, where the bit lies.
She stated it happens more often, that horses react to copper.
Has any of you had this experience?
Did Monty's team ever hear about this fenomenon?