the whole procedure you described is pretty standard and usually expected. during root canal treatment till it is completed a temporary filling is placed in the hole. this hole on the back of the tooth is where the root canal treatment is done from. however normally before the crown cutting for a permanent cap it is filled with permanent cement. the hole does not heal by itself. a filling is placed in it. if your root canal is completed then there is nothing to worry about infection. if your root canal is not completed then the infection of any will get cleared out of it. the food particles getting stuck do not cause infection per se. for further information consult a dentist online --> <link>
i feel a hole in the tooth after root canal treatment. should i worry about infection?