Intrinsic stain (that is, discoloration of the tooth structure itself, rather than a surface stain) responds moderately well to bleaching. The difficulty presented by staining that results from tetracycline use is that it is not uniform, but usually presents as horizontal light and dark bands. For such teeth, the banding effect will remain after bleaching, albeit in a lighter color.

The only practical way of eliminating the staining you describe is by covering it up. This can be done by the placement of crowns, or more conservatively by placing porcelain laminate veneers. I would advise your husband to ask your dentist about these options.