The tooth, which had blood vessels and tissue natural grown in his cheek could bond with the tissues and blood vessels in his eye, the lens alone can't, thats why contacts need to be removed every 14 hours, the eye would have eventually rejected it causing the man severe pain and loss of sight. The tooth is made of bone, and with tissue and blood vessels grown on it, would not be rejected by the body and the bone would not reject the lens.
All they would have to do then, is drill a hole in the tooth and put the lens in, then surgically place the tooth in the eye in the exact position it needs to be in to bend light the right way, then give the tissues and blood vessels on the tooth time to bond with the rest of the eye.
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