I don't know how to link an image to an ongoing thread so see "Someone Please Help" below. This is an image of some teeth I created in the spline modeler. It takes about 5 minutes to do (1.5 min to turn the machine on & launch RDS). Just set the extrusion to "pipeline" with a "free" envelope. Create elipses on 1st cross section then make 2 more cross sections, one in middle & one on end. Go to last section & scale down the elipses. Go to middle section & delete the 3 in the center. Then just play with the envelope lines to your likeing.