Auntie
use some calpol from a syringe. I wait until they cry, mouth wide open, then put syringe in mouth, and do little squirts so they only have to swallow tiny amounts not spitting out tye lot.
do not aim towards the throat though, they could choke. aim towards the inside of a cheeck instead.
you can do it. he might hate it, nobody likes being "forced" to do anything, but you know it's necessary, so be firm but gentle if that makes sense.
once he's settled down, he'll probably let you apply the Dentinox as well. It's hard work, but you are doing your best. so be proud, not sad, ok my friend?

ickle
I'm glad what I said helped. there's sooooo much pressure on us to "do the right thing" and being constantly told what we "should" do is a bloody blow to the confidence. but we must trust ourselves to know what is best in any given moment!
And if that means you choose the easy way instead of struggling so be it.
I think you are all doing very well, small babies, especially 1st ones are tough work.
so group hugs me lassies! 
And a very Happy New Year to all of you