Robert is right. There are many things that can affect the outcome of a Lumineers case, including the type of bonding agent and cements used (doctor may have used products other than what are recommended because they are less expensive, or they may have been expired), the light used to cure them (many doctors use inexpensive, under-powered hand-held curing lights for crowns and veneers, resulting in pop-offs). The best thing to do is find a doctor who specializes in cosmetic dentistry and Lumineers, as they are more likely to use the recommended materials and equipment, and have taken recommended training courses on Lumineers placement and finishing.
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Posted to Lumineers Fall Off Fairly Regularly - Arizona on 11 Oct 2011