In my practice I never give a veneer patient a night guard or retainer after veneers. The reason for this is night time bruxism is all bout a lack of oxygen. So, if you are grinding your teeth then adding a piece of plastic to your mouth creates yet another hurdle for oxygen to pass. Now to answer your question. If the impression can loosen your veneers, then there’s something wrong with them
The answer like most answers is "it depends." It depends if your smile shows your fist molar. If so, then I would suggest an e.max crown (all porcelain) because it is more aesthetic than full zirconia or gold. If your smile does not show your first molar (this is true for the majority of people) then full zirconia would be best. Another factor it depends on is your habits. If you are a grinder or clencher, then you should sacrifice aesthetics (e.max) for full zirconia. In my opinion I would stay away from porcelain fused to zirconia as the porcelain still has the ability to chip more commonly than a monolithic substance (the others mentioned in my answer).
This is a tricky question, because whitening, while effective, is still unpredictable. The short version of my answer is to try in office whitening, like Zoom! of Boost (either). In-office whitening provides a more predictable response. The longer version of my answer is this...not all whitening gels are the same. It's great that you mentioned the different percentages of peroxide in your take home gels, but you may be surprised to know there are different kinds of peroxides (namely hydrogen peroxide AND carbamide peroxide) In my experience, hydrogen peroxide gives you a better result. If you try in further and don't get what you want then you can look into a brand called Kor whitening. Not all offices offer it, largely due to the high price, but it will absolutely get your teeth whiter. It is a system that uses in office AND at home whitening and is the strongest and most predictable whitening available anywhere. This is the little secret celebrities use because they can afford to.
When it comes to your front teeth you have a few choices. The answer depends on your particular situation (the position of the teeth, is there grinding, etc). There is no one material that is the best for every situation, but there is one that I feel is the best for MOST situations. That material is known as E. MAX. This material has the best balance of strength and aesthetics. It is produced from a solid block of porcelain (no metal). This is the material I use in more the 90% of situations at my office and it's important that you find a doctor that is comfortable with the material. Each material requires a different form, and dentists aren't always familiar with each kind. Like anyone else, dentists and doctors have their favorite materials and procedures. Ask your dentist which he/she prefers and why.
It is a very common practice to go through the crown to complete a root canal. The procedure is a more difficult for the practicioner but nothing a specialist can't handle. If finances aren't an issue, you may want a new crown but it's definitely not a necesity
