One alternative to having porcelain veneers is a process called bonding. Bonding involves a tooth-colored material (resin composite) that looks like the enamel of your teeth being molded and shaped onto your tooth surface, and then hardened and polished. Bonding can be used to improve the color of a tooth, fill in irregularities, close gaps, or sometimes lengthen teeth .
Bonding is generally not as permanent a process as veneers, and can be vulnerable to the same kind of staining your natural teeth are prone to. Bonding can also be more prone to chips and cracks than veneers.
Veneers are usually preferred to bonding when such a procedure isn't deemed to be effective in the long run.