This is not necessary; however we routinely use the most popular shade guides( vita chromascope, 3d master and Ivoclar shade guides) and can convert and modify the shade you provide to match the desired restoration
For a successful case, we recommend you send the following:
There are a number of ways to successfully block out a dark preparation, we routinely recommend utilizing a composite material on the prepared tooth surface before bonding. ( you can bond on top of the composite) or you can utilize an opaque cement.
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