Can I have my teeth whitened if I have no enamel, they were 'coated' when I was small?

When my teeth grew they had no enamel on them, they were coated when I was a child by the dentist. They are only slightly discoloured but I am considering whitening and was wondering if this would affect my teeth and the procedure that was done. My teeth have never been sensitive and I only have one filling i am 27 and make regular trips to the dentist with very little problems