My husband grinds his teeth all night long, and now, they appear worn and flat and discolored. Would veneers revitalize his smile?

Start with the main problem- what's causing the excessive wear? Certainly, he is an aggressive bruxer (grinds teeth), but he absolutely must have a dentist familiar with jaw joint diagnosis check the health of both joints prior to rebuilding your husband's teeth. The bite may need to be balanced as well. Veneers will not be strong enough to withstand the heavy chewing forces, so porcelain crowns would be a better choice to restore your husband's smile.