Topic content:
In recent years, some medicated toothpastes have been mixed with a small amount of formaldehyde to protect the periodontium, so as to eliminate the pain caused by tooth heating, cold, and acid allergy. Please tell us the reason
Best answer:
Formaldehyde is a colorless liquid with pungent smell. It is easily soluble in water and volatile. Formaldehyde has antiseptic ability, which can coagulate proteins, kill bacteria, and protect periodontium. The aqueous solution of formaldehyde has bactericidal and antiseptic ability, and is a good bactericide
Answer analysis:
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Test core:
The existence form of elements in human body:
① Carbon, hydrogen, oxygen and nitrogen mainly exist in the form of water, sugar, protein, vitamins and fat.
② Other elements mainly exist in aqueous solution in the form of inorganic salts.
③ Calcium element mainly exists in the form of hydroxycalcium phosphate [Ca10 (PO4) 6 (OH) 2] crystal.