hello and welcome to HCM forum, i would like to inform you that tickling sensation after completion of root canal is sometimes normal and occurs due to the filling material, but if it is associated with pain or swelling that it might need your dentist s attention, i would have really appreciated if you would have attached an X-ray of your tooth with your query, anyways start chewing soft food with your treated tooth to check if its normal, also you must be aware that getting your treated tooth crowned is really important to avoid any fractures. start using antibacterial mouth wash for a week atleast, to resolve symptoms, if tickling sensation still persists then kindly visit your dentist or forward me your X-rays so that i can guide you further, i wish you good health.