Pony Pal

please help me with my pony !!!!!!! 10 points!?
"That is not long ago my horse Mister teeth began to chatter I have asked everyone, but have you ever heard of a horse doing this, so I come to you for help. is so bad for him, why would do this? hes very healthy and happy, but why is he doing this? How I can stop this bad habit? please guys, if you know anything let me know. and as I said he's happy, healthy and pleasant, also has a great friend to hang with her pony seems so strange for him to do this. "
is talking to them or grinding? if you can polish a stomach ulcer
