When working with wood, and using powered tools to saw, drill, plane, or whatever process is being carried out, then you are going to make noise and a lot of noise at that!
Safety when using these tools has to be a primary concern, as one misstep, and a finger is gone. Protecting your hearing when working with wood is often overlooked, however, but protecting your hearing when working with wood is a necessity.
Loud noises made by your woodworking tools (or any loud noises for that matter) will damage your hearing. You probably will not notice it immediately, but over the course of time the damage will accumulate, leaving you hard of hearing. Wearing ear protection is inexpensive, and will stop any damage to your sensitive hearing.