Demo-
Take a Dremel and put a sanding bit on it then sand the edges of the teeth, making them a little sharper near the points. I did this last year as the "points" had wore down and the bottom platform wasn't gripping as well as I like. Remember, tree type/bark plays a huge part, smooth bark trees can be problematic, especially when they are wet. I try to avoid climbing younger ash trees when they are wet since their bark is not very thick and still rather smooth.