Real teak (Tectona Grandis) is hard on ANY cutter.... I don't know about the plantation stuff, but the original areas where Tectona Grandis thrives, usually have a very high amount amount of silicic acid in the soil. It get's taken up by the roots and may crystallize to Silicon dioxide in time. Essentially, this is quartz.... embedded in the wood. Lots of tropic hardwoods display this effect, but few as much as Teak.
Regards,
Job