The first time I used the 1/8" blade on my band saw, I didn't have the thrust bearing (behind the blade) set just right. Almost as soon as I started cutting the blade pushed back to the thrust bearing and I dulled the teeth a bit on the guide blocks.
Step 1: Cutting New Guide Blocks
I had to buy a new blade and wasn't happy with how close the blocks were to the teeth again so I decided to make blade-friendly blocks. I had cut down a maple tree last year so I took a small chunk from it. Using a vernier caliper, measure the steel blocks and cut maple blocks slightly bigger then sand down to the same size. I used a knife to cut the wood blocks to length then just put them in the blade guides and set the wood blocks so they were just touching the blade. They can't be too tight because of friction but now it doesn't matter if the blade touches them a little, it just cuts into the blocks. I would recommend a harder wood like maple or similar because pine or spruce is more likely to splinter