Call the office right away. The temporary crown is there not only for aesthetic purposes but also to prevent the gum from growing over the tooth.
When it comes to whitening what matters is what brand they use and how many sessions. The job of the dental professional is to properly isolate your gums making sure that the bleaching gel doesn't burn it and supervise the process in case of any problems. But consider the price of airplane tickets and gas before getting whitening in Toronto!
You can do Invisalign: a set of clear aligners. Aligners are clear trays made in shape of your teeth and are completely transperent. You wear them 24/7, and you take them off - yes, you can do it on your own in 2 seconds - only for the food or drink. You dentist changes your aligner every two weeks checking the progress. If you have no other problem besides that gap, treatment will be pretty short - maybe 2-3 months. Before starting treatment you will actually see a movie of how your teeth move with each aligner and what they are going to look like in the end.
