Regrowing teeth and enamel as a question of belief

Frederick connects the discussion to the previous session's topic of tooth enamel, saying he believes bone can be restored but that enamel, being crystalline, is much harder.

The Wonders reply that this is only a belief, a limitation he is accepting: if the body can repair bone and repair cut skin, the same cells that began skin can begin teeth, and the only obstacle is the mind's judgment — chiefly having been told that after baby teeth one gets a single adult set for life.

They note some individuals lack some of these judgments and simply grow teeth, mentioning Willard Fuller (who they say does this to a degree, still carrying some fear) and certain tribes in central Africa, and observe that science is approaching this through stem cell research.

They tell him his further belief that a tooth cannot regain enamel once damaged is not stupid, merely another limit: do not judge the belief, change its limit.