A. The acid erosion on your teeth and grinding is one area which we need to control. the grinding is something dentists cant stop you doing but we can prescribed night guards which means if you are going to grind at least you grind the guard away as apposed to your teeth. the crowns can be replaced for more aesthetic crowns using all porcelain material. however first you could have some whitening to improve the natural colour of your teeth and then replace the crowns to match the new colour. hope all this is helpful.my advice would be to seek the help of a cosmetic dentist. if i can help please email back.