My Iphone 5s touch ID option isn't there anymore?

Ok so i had my iphone since christmas and the touch id worked just fine then a month later the option isn't there anymore and i have done all the steps to everything so what should i do please help i don't want to have to get a new one!

You may of knock a setting in the restrictions.

go to settings -> general -> restrictions -> see if touch id is off. If so just flick the switch

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