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anatomy arrow background biology blood body bone canal care caries cavity cementum chamber clean clinic clinical clipart close crevice crosssection crown decay decayed dent dental dentin dentist dentistry design digestive enamel gingivae gingival gum health healthcare healthy human icon illness illustration implant isolated ligament macro medical medicine molar mouth natural nerves normal object organ orthodontic periodontal pulp root scan science scientific surgery symbol system tooth toothache treatment unwell vessel white whitening