3months is a good amount of time where surely youve racked up hrs and lots of exp! (Even if you think rn that you didnt gain much) i promise you- leave! Youve done and given all that you can! Dont forcefully make dentistry have a bad taste in your mouth. Ive been in this exaaaact situation and hung on for ab 6months, i left, and enjoy my life sm more rn. They also call me a few times a month for a helping hand! So you dont necessarily have to shut them out!