Porcelain veneers may not be recommended for people with significant dental problems, such as advanced gum disease, severe tooth decay, or weakened teeth. In these cases, it may be necessary to address these underlying issues before considering veneers. Additionally, people who grind or clench their teeth (a condition known as bruxism) may not be good candidates for veneers as the pressure and force of grinding and clenching can cause veneers to chip, crack, or break. In these cases, other cosmetic dental treatments may be recommended.