One thing that came recommended to me was anbesol liquid if you haven’t tried that already!
What worked for us is Nurofen before bedtime and Anbesol Liquid. In the day I give him frozen fruit purées from the dummy feeder, and use the baby dental wipes to massage his gums xx
I'm following any advice on here too Lucy as my boy nearly 8 months really suffering with teething too he has 5 broken through but gaining on the side of his mouth like crazy crying off his favourite snacks and off his milk. I've even tried ambusol as that's very numbing but he just cries at me 🥺😪