Watching one of those Norwegian dramas on BBC4 I was surprised when they said yem for home. (It's actually hjem but they said yem.) That's because it reminded me of school holidays I spent in County Durham when I knew that to gan yem meant to go home. It cannot be coincidence and there are similar words in Swedish and Danish.
As for tooth, I remember one boy at school who pronounced it tuth and that annoyed me. He was from Birmingham. I cannot find a dictionary that gives that pronunciation so it must be a minority dialect. A little research tells me that the Anglo-Saxons pronounced it so as to rhyme with "both", so that doesn't help.