How do I get my naturally curly hair back?

I used this product called olive oil to straighten my hair and now it is wavy and straight at the ends. Please help me !!How do I get my naturally curly hair back?
first, stop using the porduct. second give it like a week to go back to normal. theres a shampoo and conditioner by garnier fructis called curl and shine and it mite help your hair go back to normal. nxt time u use a product to make ur hair stargiht try using sunsilk's straighten-up. i used tht and wen i stopped my hair was perfectly fine. GOOD LUCK.How do I get my naturally curly hair back?
Stop using the product! Use curl enhance shamppo and conditioner. If you wanted to straighten your hair use a relaxer.