ers ▁ ▁Professional ▁period ont al ▁ther apy ▁includes ▁initial ▁deb ride ment , ▁scaling ▁and ▁root ▁plan ing ▁with ▁specific ▁period ont al ▁instruments . ▁These ▁instruments ▁include ▁files , ▁c ure tt es , ▁after ▁f ives ▁and ▁mini ▁f ives ▁used ▁for ▁mechanical ▁deb ride ment . The ▁sh ank ▁of ▁period ont al ▁instruments ▁can ▁either ▁be ▁rig id , ▁which ▁works ▁better ▁with ▁heavy ▁and ▁t ena cious ▁calculus ▁or ▁flexible ▁for ▁fine ▁tun ing ▁and ▁light ▁depos it . ▁ ▁Period ont al ▁files ▁are ▁used ▁to ▁cr ush ▁larger , ▁t ena cious ▁depos its ▁to ▁prepare ▁them ▁for ▁further ▁deb ride ment ▁with ▁a ▁scal er , ▁c ure tte ▁or ▁ul tr ason ic ▁scal ers . ▁They ▁have ▁a ▁series ▁of ▁bl ades ▁on ▁a ▁base , ▁therefore ▁they ▁are ▁not ▁suitable ▁for ▁root ▁plan ing ▁and ▁fine ▁scaling . ▁Universal ▁c ure tt es ▁are ▁double - ended ▁instruments ▁with ▁pa ired ▁mirror ▁working ▁ends ▁and ▁a ▁rounded ▁toe . ▁These ▁instruments ▁can ▁be ▁used ▁on ▁all ▁surfaces ▁of ▁the ▁to oth ▁including ▁root ▁surfaces ▁in ▁a ▁period ont al ▁pocket . ▁Grace y ▁c ure tt es ▁have ▁a ▁stronger , ▁rig id ▁sh ank ▁and ▁ang ulated ▁working ▁bl ades ▁that ▁are ▁area ▁specific . ▁They ▁are ▁best ▁for ▁sub ging ival ▁scaling ▁and ▁root ▁plan ing ▁because ▁the ▁offset ▁bla de ▁allowing ▁for ▁greater ▁adaptation . ▁After ▁f ives ▁are ▁similar ▁to ▁grace y ’ s ▁except ▁they ▁have