tooth brushing is a compensation for eating too much sugar right? if you managed to cut sugar out of your diet somehow then it might be okay to brush your teeth less? idk
I eat a fairly normal American diet and grew up in a place with minimal fluoride in the water, and I have near-perfect teeth
I also occasionally simply forget to brush
I do chew a lot of gum with xylitol but that's a recent development
Imo tooth quality is largely genetic