Why does't the volume bar on my iPhone 4s appear?

I can't play music out loud with my iPhone. The volume bar only appears when I have headphones in and it still will disappear with them in sometimes. Could have to do with something getting wet? I've updated and rebooted my iPhone but the volume bar still doesn't appear.

Maybe you should try restoring it.

http://www.wikihow.com/Restore-an-iPhone

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