A prison visitor was caught smuggling drugs into a maximum security jail by hiding them under her false teeth.

Kimberley Fraser was caught by a specialist sniffer dog at Perth Prison and tried to hide heroin and cannabis by flicking out her dental plate and swallowing them.

The 35-year-old choked on the package and was left gurgling as it stuck in her throat.

Fraser admitted being in possession of heroin and cannabis at the jail in October last year.

She also admitted obstructing police by swallowing a package containing controlled substances.

Sentence was deferred until June 21.