Dental veneers require minimal removal of tooth structure so it can be substituted with porcelain, to change to your desired color and shape, as far as how much tooth structure is removed from your teeth, I can not see a photo of your front teeth preparation by your dentist, hopefully not much is taken off your front teeth, since then it would be called possibly a 3/4 or 7/8 dental crown.
The more conservative the dentistry, the longer your restorations will last you.
As far as temporaries, if they do not look even, or you have sensitivity, it is best to call your dentist so he can attend to those concerns, sooner than later.
Best of luck to you.
-- Dr Anthony Mobasser Reconstructive & Cosmetic Dentistry 9201 W. Sunset Blvd suite 618,Los Angeles Ca 90069 P : 310-550-0383