Following a root canal, you should be careful with the tooth involved.  Stay away from hard, crunchy, or chewy foods as this may cause the temporary filling to come out and introduce new bacteria to the site.  The tooth will remain fragile until it has a restoration.   Rinse with warm salt water if the area is sore.  Most importantly, if you experience swelling and/or a bad taste in your mouth, call the office 248-689-9191.