It is the DCN used on a dental survey site. You fill out a questionnaire and they give you DCN in return. Of course, a small amount is given. I definitely do not recommend the site. When they say 72 after 24 hours, they put you on a Block and you cannot get what your DCN savings are. I see it as a pure waste of time. Maybe it can be useful in this respect. Of course, you may notice something about teeth. Apart from that, if you ask me to fill in a questionnaire and earn money. If you say I earn without eating blocks, experience, but I would not recommend it.