DS2 is 4 1/2 and I have no idea when he will stop sucking his thumb. Our dentist isn't concerned at all - he says that it's only an issue when the adult teeth come through and that most kids stop by themselves before then. I'm thinking that we are fast running out of time - although DS1 hasn't lost any teeth yet so I might be stressing too much. Anyway, he also said that trying to make them stop can have the opposite effect. I am thinking at this stage that I will see how he goes when he starts school next year. Hopefully that will stop him!

Back to your question - I don't think that could happen in a week unless they were already loose. But I don't know.