my dental hygienist , farmahat , is very thorough and very friendly. she also would ask me how best i am confortable to the kind of treatment for me. at first, i didnt like the machine and explained to me the advanatage and saidn she will try it first and apply a paste to put first so it wont be painful. it works, so she used the machine and did also by hand . it felt clean. also, dr birek has always been nice and is interested in my well-being.