Upper 2 front teeth & 1 lower front feel rough (sandpaper) from inside sometimes, got cleaning done last week, no plague or tartar was there to began with. i floss daily too, should i just brush them better?

Always brush your teeth as well as you can and see your dentist twice a year for your exam and professional cleaning.

You should be brushing 2x/day for 2 full minutes by the clock with a soft toothbrush. You should also be flossing daily. You should also see Dentist 2x/year for professional cleaning. That said, return to your Dentist to evaluate the rough areas on your teeth. He/she should be able to easily smooth the rough areas.