My son, almost 2, sucks his finger (the one next to his thumb) almost 24/7. This obviously shows in his teeth, with an overbite already. I tried to get him interested in a dummy from birth but he always wanted his finger.
As he has been really troubled by teething, I didn't want to do anything until all his teeth were through and he was happier, but they are all through now, so please I beg you, tell me all your ideas and I shall try them all.
He is incredibly strong minded so it may be a really big battle of wills!!!!