The reason is that the tongue coating is not cleaned thoroughly when brushing teeth, and the food residue on the tongue is in contact with oxygen, which will produce unpleasant sulfides.
1. Using medical-grade stainless steel material, safety is guaranteed. (while the plastic one may contain harmful chemicals)
2. Precise tongue scraping, good comfort. (while the plastic one may cause retching)
3. Convenient to clean, can be cleaned with hot water (while the plastic one may be deformed)
4. No mildew (while the plastic one may be mildew)