How can I darken my veneers?

This is excess temporary material and not cement that you are seeing.  I would get to your dentist and have them remove so that it does not irritate your gums making it more difficult to bond in your permanent veneers.  It will be fairly easy to get off.  

Hello there,Wearing your temporaries for a month is not a huge concern.  I would recommend getting your final veneers as soon as you return from out of town though, since they are of course only meant to be temporary.  Until then, be careful with your temporaries so they don't fracture or come l...

I would recommend orthodontics. Your teeth are so out of position that placing veneers before orthodontic treatment would not provide good results. See an orthodontist to get your teeth in the proper position first before considering veneers. I hope this helps.  Follow me on RealSelf for if yo...

Temporary veneers don't bond well to the teeth because they are designed to come off easily. This can allow bacteria to collect under the temporaries. When your permanent veneers are placed, the area will be cleaned and disinfected. Decay is a much slower process.  I hope this helps. Follow me f...

The provisional period for veneers should only be for a few weeks at the maximum. What is the reason for waiting on the final restorations?  Permanent veneers should stay in if they are bonded to the teeth. If you are waiting and the veneers are already made, it may be very difficult to seat ...

While it should not be difficult to remove the veneers, in a very SMALL fashion the enamel will be changed.  Will it be clinically significant? Not really. Just like removing brackets when braces treatment has completed, there IS change, but not enough to discourage treatment.