brushing with too much pressure or with a brush that is anything but soft will wear away tooth enamel. baking soda usually won't do any damage. but if you have thin tooth enamel to start with and you’re using a hard bristle toothbrush and a lot of pressure you'll probably end up with problems.
is it safe to brush my teeth with baking soda every day? how does baking soda effect tooth enamel?