Apex domains cannot have CNAME records.
Question and response
Question
dig wwwdentemax.com. NS
Answer
wwwdentemax.com. 5 NS ns2.wwwdentemax.com.
wwwdentemax.com. 5 NS ns1.wwwdentemax.com.
Authority
The response has no authority records.
Additional
ns1.wwwdentemax.com. 5 A 51.89.232.109
ns2.wwwdentemax.com. 5 A 51.77.98.34
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0