Are there any new techniques to "re-grow" enamel if I wanted my veneers removed?

Unfortunately, regrowing enamel would only be possible through the use of stem cells, which is still considered experimental at this time.  I would recommend getting your veneers redone, if you feel that they may be unsightly for you.  Placing composite fillings at the top of the veneers is only a temporary fix and usually only makes the situation worse, because composite stains very easily.  Good luck and I hope this helps. Follow me if you have more questions.Sarah Thompson, DMDReal Self 100

Unfortunately, there is not a way to have the veneers removed and regrow new enamel.  You may have gum recession causing the margins to show and accumulate stain.  Have your dentist take a look and make some recommendations to help alleviate your concerns.  Good luck.  

sorry, that is not possible, teeth are the only part of human body which never regrow. so only option for u is go for reveneering.