In a controversial opinion, Dr. Michael Zuk, a Canadian DDS, profiles in his opinion and problems of overuse of porcelain<unk>  by certain cosmetic dentists in 'Confessions of a Former Cosmetic Dentist'. He suggests that the use of<unk>  for 'instant orthodontics' or simulated straightening of the teeth can be harmful, especially for younger people with healthy teeth. Leading dentists caution that minor superficial damage or normal wear to the teeth is not justification for porcelain or ceramic<unk> . This is because the preparation needed to apply a<unk> may in some cases destroy 3–30% of the tooth's surface if performed by an inexperienced dentist. It has been found that after 10 years, 50% of<unk>  are either displaced, need re-treatment, or are no longer in satisfactory condition. Some cosmetic dentists may push unnecessarily for prosthodontic treatment in adolescents or young to middle-aged adults who have otherwise healthy teeth that only necessitate whitening or more routine cleaning. As preparation for<unk>  requires shaving down the tooth in some cases, sensitivity and decay will be a problem even if the procedure is properly performed. In addition, a<unk> s maintenance cost can also be prohibitive for many individuals.<unk> placement should be limited to individuals with significant aesthetic problems, such as badly cracked or broken teeth, that do not meet the requirements for a crown or full replacement. Additional contraindications include but are not limited to the following: poor oral hygiene, uncontrolled gingival disease, high cavities rate, parafunction, no enamel, unreasonable patient expectations, large existing restorations.
Veneer 
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Wart
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Lint 
Jim 
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