I have only given the teething powder (homeopathic based) just recently as it was in a lactose base, but i think in the UK you can get ones that are in drops form, without the lactose base, the brand is called Weleda.
Otherwise you can use a local anesthetic gel called lignocane - its for babies who have had a circumcision
We save this for when his tooth is cutting. It lasts 6 hours