Some of the newer tray style bleach systems only need to be worn 2 hrs. Most people wear these between dinner and bedtime. Since you are a clencher you may experience some sensitivity. Alternating a flouride gel in the tray with bleach everyother night usually helps.
I have found that the members of the American Academy Of Cosmetic Dentistry are the best clinicians. Cosmetic procedures are very demanding. In providing these services one has to fine tune their diagnostic skills, analyze the occlusion, etc. Be sure to view before and after photos and make sure he or she is a good listener and addresses your concerns. DON'T respond to the flashiest ads.
Invisalign Express is treatment that can be completed within 5 months (10 aligners). Typically minor space closure or anterior tooth rotations can be corrected in this time frame. The cost to the dentist is less in an express case, which translates to a savings to the patient. You need to be careful about attempting to move teeth too quickly to fit within this timeframe. Invisalign is very particular about which cases fit within the express parameters.
Cosmetic dental procedures can range from simply whitening teeth, combined with reshaping minor discrepencies, to a full mouth smile makeover. If you are not pleased with the shape of your teeth due to wear, malformation, chipping, etc. some sort of bonding or veneers would be the treatment of choice. If you want teeth lengthened then either laser treatment in recontouring the gum tissue may work. However, veneers or more conservative direct bonding will result in more tooth display on smiling.
Invisalign is a perfect solution to your problem. Closing spaces is the easiest application for Invisalign in most cases. Many of our patients are those who previously underwent conventional orthodontics and have a relapse due to not wearing a retainer.