Is a crown chipping in 2 days something usual?

I am sorry to hear about your experience with your new dental crown. Though it does seem excessive to have six attempts to match the color of your crown, there are some teeth shades that are very difficult to match and require several attempts before a perfect match is achieved. As far as breaking after two days , I would replace the crown at no cost to the patient.  Clenching and grinding can place added stress to crowns and cause breakage,  but not after 48 hours.  I would get a nightguard and wear it every night after your crown is replaced.  I'm sure if you discuss your concerns with your dentist he/she would warrant the crown after such a short period of time.  Hope this helps.  

Hi Luka  I think that if you were given a heads up on the grinding and wearing bite guard by the doctor before placement of the crown, you could be responsible for the cost he has quoted. I would not charge you for it because I do not think this is the way to keep you as a patient  and make you happy. I would replace the crown and make sure you wear the bite guard and do everything to help you stop grinding. I would make sure your bite is correct as well. Take good care and listen to your dentist!

If you were advised about your grinding habit and were told to wear your night guard, and you did not wear it, then your dentist is correct in having you share the expense of a remake.