My itouch has wifi bars but doesn't connect to the internet?

My itouch 4th gen has the wifi bars but can't connect to the internet. I can't get on the app store,safari,google crome or anything that has to do with wifi. I'm 100% that i have the correct password. It work a few days ago and now its not working. I tried forgeting the network and getting ack on it but... show more My itouch 4th gen has the wifi bars but can't connect to the internet. I can't get on the app store,safari,google crome or anything that has to do with wifi. I'm 100% that i have the correct password. It work a few days ago and now its not working. I tried forgeting the network and getting ack on it but it still doesn't work. I don't think its our router because my brother has an iphone 4s and it can connect to our wifi but my itouch 4th gen can't. Can someone help?
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