Almost every fossil shark tooth above a certain price point has been touched by a preparator. Mineralization is rarely perfect, roots chip during recovery, and tips break during transport or feeding wear. The question is not whether restoration exists but whether it has been disclosed and whether the work was done with integrity. Understanding the spectrum gives a collector the ability to evaluate any specimen they consider.
The Spectrum
Restoration practices range from minor stabilization (consolidant applied to a fragile root edge) to extensive reconstruction (a tooth assembled from multiple fragments with resin fills). Each step along the spectrum is acceptable in the right context, provided the work is disclosed in the listing.
Acceptable Restoration
Consolidant. A thin layer of archival consolidant applied to a fragile root to prevent further deterioration. Invisible to the eye, fully reversible, considered standard preservation practice. Should be noted on the CoA but not deductive of grade.
Bourrelet repair. The bourrelet (the line between root and crown) is structurally weak and often chips during recovery. A minor bourrelet repair with disclosed resin is acceptable on a fossil specimen and typical at grade B.
Tip restoration. If a tooth was recovered with a broken tip and the tip has been reconstructed in resin to restore the silhouette, this is acceptable provided it is disclosed. A reconstructed tip should be specifically noted (“upper 1/8 inch of crown is reconstructed in resin”), not vaguely referenced.
Root reattachment. If both root lobes are present but were separated during recovery, careful reattachment with archival adhesive is acceptable. The seam should be noted.
Borderline Restoration
Heavy resin fill on the crown face. Substantial restoration of the enamel surface raises grade questions. Grade B at best; some collectors will pass entirely. Must be fully disclosed with extent and location.
Multi-fragment reassembly. A tooth assembled from three or more fragments with resin work between them is a restoration project rather than a natural specimen. Pricing should reflect that.
Painted serrations. Painted reconstruction of serrations along a worn edge is borderline. It can be done well or done badly. When done badly, it is visible under magnification and undermines the specimen.
Unacceptable Restoration
Undisclosed work. Any restoration that is not stated in the listing or on the CoA is unacceptable. The work itself may be defensible; the failure to disclose is not.
Fabricated provenance. Attaching false locality or era information to a specimen is fraud. A fossil tooth from one formation labeled as another, or a modern tooth labeled as pre-ban without supporting documentation, are not restoration questions; they are authenticity questions.
Cast or replica passed as natural. Resin replicas of teeth exist and are legitimate as educational objects. Passing them as natural specimens is fraud.
How to Detect Restoration
A 10x loupe and a 365nm ultraviolet lamp will reveal almost all restoration on a fossil specimen. Resin and most archival adhesives fluoresce under UV in a way mineralized tooth tissue does not. Spend a few minutes with both tools and you will see what is original and what is added.
What to Ask
For any specimen above a few hundred dollars: ask the seller directly — “what restoration has been done to this specimen?” A reputable seller will answer specifically. A seller who deflects or generalizes is telling you something.
The Honest Conclusion
Restoration, disclosed and done well, is part of the trade. Grade A means no restoration. Grade B means modest, disclosed restoration. Both are legitimate categories with legitimate buyers. What matters is which grade you’re buying and whether the seller is honest about it.