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<p>[QUOTE=&quot;Bronwen, post: 4488569, member: 5833&quot;]There are times when I have not been 100% certain either.</p><p><br /></p><p>Just tried an experiment to see if I was remembering correctly about this.&nbsp; Believe it or not, I can detect a difference when I apply the &#039;tooth test&#039; to pieces that are stone &amp; a piece that is glass.&nbsp; All feel equally smooth to a fingertip.&nbsp; They feel smooth to the teeth too, but there is an ever so faint graininess to the stone while the glass is absolutely slick.&nbsp; And I&#039;m doing this with teeth that have been crowned; difference might be even more noticeable with natural teeth![/QUOTE]</p><p><br /></p>

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