The saliva produced by dental paste is not to be swallowed. The main function of dental paste is to make the tooth enamel white by oxidation reaction. The drug ingredients contained in the dental paste are highly concentrated oxidants such as hydrogen peroxide and carbamide peroxide, and there are also matrix and desensitizing substances to maintain the stability of the gel, so the composition is more complex. After the dental paste is adhered to the tooth surface, it is easy to stimulate the parotid, submandibular and sublingual glands to secrete a lot of saliva. If the patient cannot spit out in time, or apply a saliva sucker to suck away the liquid, it is easy to stimulate the mucosa of the esophagus and other digestive tract after swallowing. After the liquid enters the stomach, it can cause irritation to the gastric mucosa and discomfort symptoms such as burning and pain. Whitening tooth paste must be strictly operated when applied to avoid danger.