Hi.. Can understand your concern.. As per your complain pain in teeth that were filled can occur due to either opening of its nerves and vessels while removing of the old filling and placement of the new filling leading to inflammation of the nerves causing pain. As far as sensitivity is concerned it mostly occurs after 4 to 5 days of doing filling and subsides itself while pain is due to inflammation of nerves. Other reason for pain can be SECONDARY CARIES or INFECTION which occurs below the filling either due to seepage of debris and bacteria through the filling if it is not properly done or if the active infection is left out during the filling of tooth which progresses further causing infection and inflammation in the nerves and blood vessels of tooth. I would suggest you to consult your dentist and get an IOPAR (x ray) done to rule out the cause of pain and if it is due to exposed nerves root canal treatment along with antibiotics and painkillers can solve the problem. Till the time treatment is being done avoid consuming very hot and very cold food and take soft diet to avoid discomfort. Hope your query is solved.. Thanks and regards.. Dr.Honey Nandwani Arora.