Another great popular science/history book by Bill Schutt, again with wonderful black and white illustrations by Patricia J. Wynne. Like his other books, it is accessible, informative, witty, and interesting. This particular book is on teeth (and biting) in the animal kingdom and among humans, covering many things you might wonder about your own teeth such as tooth decay The first thirteen chapters are on teeth in animals as well as basics on teeth that often apply to humans and animals, with the last five chapters are on human teeth and related topics such as myths about tooth decay and the history of dentures and dentistry.
The first two chapters cover topics Schutt dealt with in his excellent _Dark Banquet: Blood and the Curious Lives of Blood-feeding Organisms_ (vampire bats in chapter one and the candiru in chapter two). Chapter three was a fascinating chapter on horse teeth and their evolution, introducing the reader to such concepts as brachydont dentition (low-crowned teeth, such as might be found in animals feeding on soft plants), hypsodont dentition (high-crowned teeth, better adapted for the wear-and-tear of abrasive silica-rich grass), and occlusal surface (the “bumps, points, and ridges on the surfaces of teeth that come into contact with those of the opposing jaw when the jaws occlude” or close). Chapter four was another great chapter, this one mainly on tusks; the first tusks in the fossil record (in dicynodonts), narwhal tusks (elongate left upper canine teeth), elephant tusks (modified upper incisors), homodont dentition versus heterodont dentition (teeth being the same shape and size versus containing up to four different types of teeth in a mouth), and how manatees and elephants go through molar replacement (up to six times in elephants) through a process called hind molar progression. Chapter five was on teeth in venomous snakes, discussing the differences between opisthoglyphous snakes (rear-fanged snakes like boomslangs, with two pairs of grooved, venomous fangs near the back of the mouth), proteroglyph snakes (smallish fangs at the front of a pair of upper jawbones, in family Elapidae, includes cobras, mambas, coral snakes, and sea snakes), and solenoglyphous snakes (the vipers, with much larger fangs; includes rattlesnakes, copperheads, and water moccasins). Chapter six looked at teeth in fish, such as the coral munching teeth of parrotfish, the more delicate teeth of surgeonfish, the dangers to Atlantic coral reef fish (and the reefs they interact with) due to invasive lionfish, the venomous spines of stonefish, and two genera of fish that have venomous bites, the “strange little deep-sea eel, Monognathus” and the “pint-sized reef denizen” commonly known as the fang blenny. Chapter seven was on shrews. Chapter eight covered teeth in alligators, crocodiles, gharials, and caimans and had interesting things to say about bite force in crocodilians as well as mammals (and the related concept of diphyodont dentition – having two sets of teeth over an animal’s lifetime – and polyphyodont dentition, which means a continuous supply of teeth).
Chapter nine looked at the overall origin of jaws and teeth in the fossil record particularly among early fish, the still living jawless fish the lamprey and hagfish (and what they have to use as “teeth”), the famous placoderm fish of the Paleozoic, the origins and structure of shark teeth, and revisits the concept of polyphyodonty or continual tooth replacement. Chapter ten “A Painless Guide to Tooth Basics” did indeed cover basics like the three basic ways teeth are attached to the upper and lower jawbones (acrodont dentition, pleurodont dentition, and thecodont dentition), revisited concepts like homodonty (when all the teeth have the same general shape) and heterodonty (incisors, canines, premolars, molars). Also concepts like the pharyngeal jaw. Chapter eleven looked at edentulism, basically when vertebrates whose ancestors had teeth, lost them. Much of the chapter is on frogs though fish such as seahorses get a little coverage. Chapter twelve continues the theme looking at tooth loss in turtles as well as well as gastroliths in sauropod fossils (to act as “teeth” of a sort to process plant material) and a little bit on the loss of teeth in early birds. Chapter thirteen looked at loss of teeth and the development of amazing tongues three different times in an anteater/termite eater niche (myrmecophages) in anteaters, pangolins, and echidnas and the evolution of toothless baleen whales.
Chapter fourteen and on are on humans. This chapter spends a lot of time on the story of George Washington’s dentures as well as dentures in general. Also looked at forensic odontology, the history of tooth pulling, barber-surgeons, the history of dentistry, French surgeon Pierre Fauchard (1678-1761, the Father of Modern Dentistry), the trade in teeth sold by living people to make money (including a trade in teeth from enslaved people), the history of dental implants, and how human teeth grow. Chapter fifteen covered Etruscan dental appliances (purely ornamental, the very first in world history), other ornamental dental appliances such as among the Maya, more on tooth pulling (such as the pelican, “the go-to instruments for tooth pullers”), how tooth infections can be fatal, the history of dental fillings (and controversies over amalgam fillings), and the story and science of fluoride as it relates to dental health. Chapter sixteen was all on tooth decay, covering the independent invention across multiple cultures of the idea tooth worms caused the decay, as well as a lot on the science of tooth decay including the bacteria involved and the different ecological niches in a person’s mouth. Chapter seventeen looked at wisdom teeth, the development of teeth in embryos, and deciduous precursors (baby teeth or milk teeth). Chapter eighteen was cutting edge things relating to teeth such as computer assisted techniques to produce crowns, research into links between the subgingival bacterium Porphyromonas gingivalis and Alzheimer’s disease, the use of fossil teeth to study Denisovans and Neanderthals, study of teeth to unravel the mystery of conodont fossils (ancient distant relatives of hagfish that were diverse and lived from the Late Cambrian period until the end of the Triassic), and how study of tooth regeneration in alligators might one day apply to humans. The epilogue was fun, with a great discussion of Platybelodon, an extinct elephant relative called a gomphothere that had a spectacular set of mandibular tusks that earned it the nickname shovel-tusker.
Has extensive notes and an index. I recommend _Bitten: True Medical Stories of Bites and Stings_ by Pamela Nagami for more on animal bites. Much of it is on insects, venom, and infectious disease, but bites from toothed vertebrates are definitely covered. Also _Skeleton Keys: The Secret Life of Bone_by Brian Switek has some good coverage of the origin and evolution of bone and of jaws that would nicely add to what _Bite_ has to say on the subject.