What Happens to the Teeth Underneath Veneers over Time?

As your already know veneers are a thin porcelain facing that is bonded to the front surfaces of your teeth. Before the veneers are bonded, the teeth that will receive the veneers are disinfected and a composite cement is used to seal the teeth under the veneers. This seal is very strong and should not allow for contamination of the teeth under the veneers.
Thus because the teeth are sealed under the veneers there should be no risk for odors which is a may be a result of bacteria.
When veneers are properly placed and regularly maintained like natural teeth, they can last a long time a provide you with many years of beauty.

Excellent question. As long as an experienced cosmetic dentist did the work, and you take care of your teeth and veneers as instructed, your teeth will remain healthy over time. An experienced dentist will give you a result that looks good, feels good, and lasts a long time.