Juergen Freund / Bornean Orangutan (Pongo pygmaeus wurmbii) 'Siswi' brushes her teeth, a behaviour she mimics from humans, Camp Leakey, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Petra Wegner / Blenheim Cavalier King Charles Spaniel, sitting with dog's toothbrush in mouth

Petra Wegner / Female tricolour Cavalier King Charles Spaniel having teeth brushed, model released

Petra Wegner / Female tricolour Cavalier King Charles Spaniel, having teeth brushed, model released

Ernie Janes / Silhouette of House spider (Tegenaria domestica) on toothbrush, UK

Mark Taylor / Brushing the teeth of a ginger Maine Coon kitten. Model released

Suzi Eszterhas / Serval (Leptailurus serval) kitten, five week old orphan being groomed by Suzi Eszterhas with toothbrush which resembles shape, size and texture of mother's tongue, Masai Mara Reserve, Kenya

Suzi Eszterhas / Serval (Leptailurus serval) kitten, five week old orphan being groomed by Suzi Eszterhas with toothbrush which resembles shape, size and texture of mother's tongue, Masai Mara Reserve, Kenya

Jane Burton / Domestic Cat {Felis catus} Grey Burmese-cross kitten with handler cleaning teeth using toothbrush, Model released

Norbert Wu / Toothbrush Leatherjacket (Acanthaluteres vittiger) juvenile, South Australia, Australia

Suzi Eszterhas / Serval (Leptailurus serval) five week old orphan cub being groomed by Suzi Eszterhas with toothbrush which resembles mother's tongue, Masai Mara, Kenya