This sequence enables the treatment of the vast majority of root canals using just three instruments while fully respecting biological standards that have been recognized for years. The sequence of instruments has been designed in such a way that the tip is never fully engaged, thus ensuring maximum safety. For improved efficacy, BT-Race instruments are fitted with a “Booster Tip” (BT-Tip) patented by FKG. Using this sequence with a BT-Tip, practitioners are able to achieve various apical preparations in all types of canal systems with unparalleled ease.