This girl is using a special mouth tray and bites into an insery saturated with flouride solution that can be applied to the entire upper or lower dental arch. This is one of the possible techniques to prevent tooth decay
Close-up of the head of a young girl; she is using a mouthpiece with a tube that provides a continual supply of a flouride solution. Verso: WHO/16356. Euro. Dental Health. Switzerland.
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World Health Organization; Source: Record; Research date: 20151009