Ios7 iphone 4 message notifications?

I have ios7 on an iPhone 4 and it says i have 4 unread texts in my messages app even though I don't. How do i get rid of this notification?

Drop down. Swipe and delete

1. Try to close the app with double click on the home button
2. Try to restart the phone
3. Make a backup and restore your iphone from the backup
ps before doing Nr.3 you could go to an apple store if you are near to one so you don't waste time.

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