I have a form 1+ and added a form 2 over a year ago. The form 2 is night and day improvement over Form 1+. My print success rate across a range of materials is probably 99%. I have had one failure just the other day which was likely due to a resin tank that had been sitting with flexible resin in it for months and I may not have gotten the clear surface cleaned off enough.
I have printed in white, grey, clear, black, flexible, dental, and tough resins with great success.
i have also printed a negative mold of a tooth arch and it is fanstastic.
The only question I would have is what is the purpose of printing the teeth. Make sure he matches the resin with the needs of the printed item and that the parts are cleaned and cured properly.