Well - we tried different toothpastes and different toothbrushes - At that age though, you cant really reason with them can you? hehe
So I would just say perserverance (spelling? lol) - We just kept at it same times everyday throughout the dayy - it took awhile but eventually it became something hes just used to! - He even opens up his mouth now! - Just try not to stress because I am sure they can see this and feed off it because they probably find it funny! - Remember, they will all fall out agian in a few years so if you can keep them tip top till then, youve done a decent job hehe