Preguntas Frecuentes

(According to Reddit): Its a mix of ash, rust and a few other bits and bobs depending on which tradition is followed.

It used to be a common "hiso" type fashion to rub your teeth with various blackening agents, and it became very common across most of Asia, said to prevent tooth decay.

In Pee Mak, its mostly there to add to the silliness, but this is something that older Thai folks still remember parents / grandparents doing it.

It can also be a side effect of chewing Beetel nut (a carcinogenic substance, used by older generations in various countries).