What Can Be Suggested to Prevent Cracking of New Porcelain Veneers?

Porcelain veneer are so popular because they work. 

If your bite is good, wear a night-guard if you clench or grind, and exercise some good common sense. (No biting cuticles please- we have tools for that).   It's not unreasonable to get 10-15 years out of your veneers and maybe more.

I have noticed that although veneers do not stain, they do tend to look dated after about 15 years.  Funny to think that our teeth may need updating too (color that was "just right" 15 years ago, may seem too dark for modern tastes, etc). 

Veneers are like fine china.  With careful, mindful attention they will make you smile for many years.

Good Luck and a Healthy, Bright Smile

You can help maintain the appearance of your veneers by applying a few simple principles.  See your dentist regularly to keep an eye on the veneers, have your dental office use specific prophy pumice that is designed to be less abrasive than regular pumice, and use common sense.  Your veneers are extremely strong, but like natural teeth you can break them by being careless.