My first ds had a shocking time teething. I was told about the teething necklaces from an italian friend and got one for ds2, he had 3 teeth come through all at once with no hassles, I do believe the teething necklace worked for him as I took it off to give it a clean for a few days and he was quite irritable, but like anything I guess not everything works for everything!
I've never been a fan of bonjela and never found it helps at all. There was also a story on it recently re concerns of bubs overdosing from the ingredient Choline Salicylate when used all the time.
I was advised by a paed to give panadol then nurofen half an hour later when bub was in severe pain, the 2 combined work wonders.