"Nature gave us lips to conceal our teeth," ran one popular Victorian maxim, alluding to the fact that before the birth of proper dentistry, mouths were often in a shocking state of hygiene.
More generally, the gap between the necessary and the cosmetic is wider in dentistry than other areas of medicine, making it hard to agree on what the state should subsidise.
Combine foreign advanced experience through the dentistry teaching research of more than 30 years, press Chinese state of the nation to develop 200 various products.