How Can I Find out if I Developed a Septal Perforation Following Septoplasty?

I had surgery last december with no complications other than a constat feeling of numbness(and sometimes mild pain) , on the interior of my nose, that sometimes appears to be on the roof of my mouth. My surgeon said he used the "swinging door tecnique" . Any ways I can check by myself for a perforation? Water or light trough the nose? Thanks for your time.