Supposing i have exposed dentin due to aggressive brushing, do i still brush the dentin part of my teeth?

Brush it all.: You need to clean the whole tooth to prevent gum'line cavities and gum problems. Dentin is softer than enamel and more likely to decay. Use a soft brush (especially if you are aggressive); there are many inexpensive electric brushes that are good. Many times recession can be caused by clenching or ginding your teeth while you're sleeping and unaware...