Table 1.
Number of willingness-to-pay studies in each continent and country
| Continent and number of studies | Country | Number of studies | Europe 26 studies (47%) | UK | 8 |
| Asia 13 studies (23%) | KSA | 3 | Italy | 5 | |
| Hong Kong | 3 | Norway | 3 | ||
| Iran | 2 | Finland | 2 | ||
| Thailand | 2 | Bulgaria | 2 | ||
| Singapore | 1 | Croatia | 1 | ||
| Scotland | 1 | ||||
| India | 1 | Switzerland | 1 | ||
| Philippines | 1 | Germany | 1 | ||
| North America 11 studies (20%) | Canada | 8 | Netherland | 1 | |
| USA | 3 | Sweden | 1 | ||
| Africa 2 studies (4%) | Kenya | 1 | Australia 1 study (2%) | Australia | 1 |
| Tanzania | 1 | South America 2 studies (4%) | Brazil | 2 |
(%) = proportion to weight of each continent in the existing dentistry WTP studies