I recall reading this tidbit from an earlier thread in FAOL: as I understand it, walleye teeth are like nails - rounded, all the way up to the pointed tip, while the sides of pike teeth have sharp edges from the base to the tip.
Whatever the anatomical realities, if pike are in the area, I don't fish without a steel or a kevlar tippet. Tried 30# flourocarbon once but had two bite-offs in one morning, so that experiment was canned. Can't recall a walleye bite-off, though. ..TIM.