In 2010, he went back to school to study political science - he eventually earned his BA degree at the University of Hamburg in 2013.

From January 2014 to March 2020, Thering was employed as an executive assistant at the care services provider Pflegen & Wohnen Hamburg GmbH.

[6] During this time, he was the spokesperson for the Alstertal region as well as the representative of the sports department of the CDU Wandsbek parliamentary group.

In the general election on February 23, 2020,[7] Thering was once again appointed as the top candidate of the CDU Hamburg in the Alstertal-Walddörfer constituency.

[10] He, alongside the CDU Hamburg, supported the initiative "Put an end to gender language in administration and education" in February 2023.

[14] Party researcher Elmar Wiesendahl commented in an interview on 25 June 2022 that ‘the plan of parliamentary group leader Dennis Thering to lead the party into the election is a subscription to defeat’ and pleaded for "a prominent newcomer, like Walther Leisler Kiep once did" in order to "connect with Hamburg's business circles".