If you are getting veneers, lumineers or otherwise, the biggest mistake dentists make is to not prep enough between the teeth. You can bring out the smile a couple of mm and it won't really look different, but if you don't leave room for interproximal space between the teeth they will be too wide. I took a variety of veneer courses, and the lumineers people are not being honest if they say no prep. Lumineers are good because they are thin, but they look lousy if you don't prep at all.
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If you are getting veneers, lumineers or otherwise, the biggest mistake dentists make is to not prep enough between the teeth. You can bring out the smile a couple of mm and it won't really look different, but if you don't leave room for interproximal space between the teeth they will be too wide. I took a variety of veneer courses, and the lumineers people are not being honest if they say no prep. Lumineers are good because they are thin, but they look lousy if you don't prep at all.