I have two temporary crowns on my front teeth for two weeks,3 days and they are already yellowed.

Thank you for your inquiry. Yes, your whitening trays should completely cover your teeth for an even whitening. Also, this will effectively seal your teeth so whitening gel does not irritate your gums. You should definitely speak with your treating dentist and it should be a simple fix to make...

Thank you for your question. I would recommend not to eat for an hour and only foods, which do not have coloring in them. Consuming food containing color should be avoided for 48 hours.

Hi there, Typically immediately after brushing is the best time to whiten teeth, this is when your tooth surface is the cleanest with the least amount of food and plaque debris. Good luck!