-my son seem to be teething, but his Getting his back teeth, he woke up crying so bad and I check…

-my son seem to be teething, but his Getting his back teeth, he woke up crying so bad and I check his teeth , they were red and swollen gums... what can I give him for his teething pain??? I have tried Teething Gel Hyland's baby. but it don't seem to work well with him.... please help I have a miserable baby... please and thank you