I need advice.

My son is five months old. He used to be great at naps. Now I have to rock him to sleep. When he is asleep I wait until he has been asleep for 30 minutes. I then go to put him in his crib. The second I put him in his crib he wakes up and won't go back to sleep unless I'm rocking him in my arms. He is teething. His two front bottom teeth cut through a little over a week ago. I use baby orajel, Tylenol every 6 hours as needed. I play white noise. I use blackout curtains. Nothing seems to work anymore. I even bought him some new teething toys.