The patented seal that is formed with the one of a kind fit of Youngs screw-type prophy cups is what make Youngs TS2 metal prophy angle unique. This seal allows for long, consistent performance as it prevents fluids and abrasives from entering internal parts. Maintenance is easy through steam sterilization, while lubrication is only necessary once every 40 prophies. Full 3-year warranty* when used with Young cups and brushes. *All Young TS2 style angles must be used exclusively with Young Cups and Brushes. Use of other brands will generate heat or cause the angle to stall and voids the warranties.