Well that’s not wrong though. Misaligned teeth can wear down faster, causing issues down the road. Also it can cause headaches and a bunch of other issues.
As for the toothbrush, was it the oral b IO? Mine did too, and I reluctantly bought it. The reason is I press too hard when brushing and I was affecting my enamel and gums. My dad and brother both do the same and both had to get gum grafts. The toothbrush notifies you with a light if you press too hard (or too gently), so it helps train me. I’m liking it