Heat activated nickel-titanium machine to file the quality of the large taper file with the root canal.

1. With unique precursors, it can be highly adaptive to the root canal channel.

2. After special processing, the S3 ni-titanium root canal system has the smoothness and improves the crack resistance.

3. The unique thread design is designed to avoid running out of the apical hole.

4. The three systems are quick and efficient, and the single length is easy to operate.