after using a program to look closely at it, I can just about 99.9% assure you that it is a blade of grass. The way it is creased in the middle just slightly, and has the 'ripped' look. Why it is stuck like that, I don't know. I would try putting some baby's teething gel around it, have someone else hold his mouth- and gently try to edge your fingernail over it. Be warned though, that if it's been there a while, his gums could be very sensative underneath.
Thank you. I will do my best attempt at this as I do not have help with my horses. But I will let everyone know what a moron I am tomorrow if it in just grass.. smh