Really. The Thai tooth powder bought on the train is real. The products of the salesmen on the train are all taken from the company. Every product sold on the train must be reported to the passenger section for approval, which is absolutely formal. The main way of cleaning and whitening teeth with Thai tooth powder is to achieve the effect of cleaning and whitening teeth through the friction between solid particles in tooth powder and teeth, which has a certain effect on health care and cleaning teeth. But it is not suitable for long-term use, which will cause certain damage to teeth.