I’ve administered the local anesthetic, and I see blanching, but I don’t get any
pulpal anesthesia. Why?

What is likely happening is the needle is impinging on the crest of bone. The
anesthetic is diffusing into the buccal soft tissue which is why you are not
getting any pulpal anesthesia. To correct this, make certain that your needle
is in contact with the tooth the entire time and that the tip is placed at the
entrance of the PDL space. This will ensure that the anesthetic will be deposited
in the PDL space so that you achieve pulpal anesthesia.

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