Office is simple with min equipments. personal openion: sloppy dentist. the following is my story :
On a routine Check, Dr liu found an infection in my one tooth,He recommended a surgery to treat the tooth. he said "simple and easy , everything will be OK after that", however, after the surgery, The cut is swallon and I felt hurt whenever I eat , then he performed 2nd surgery ,the result is even worse, not only the tooth is hopeless and has to be completely removed , another adjacent tooth was also infected by the infection one.
out of 
