You should advise the people in the Telegram channel to run away for this airdrop. When someone asks you your private key, you can be sure is a true 100% scam!
I can't advise the people in the dentacoin telegram channel to runaway because the comment/reply section is disabled from the start.
It seems it was disabled intentionally so that no one could warn anyone what they are doing.
All I could do in telegram is report the dentacoin channel that its a scam but until now it's still working.