I completely agree. Quote: "Its appearance is loosely based on the Greek hoplite helmet; particularly the Corinthian-pattern helmet, with a molded face mask. The design of the face depends on the gender of the wearer." (https://elderscrolls.fandom.com/wiki/Dwarven_Helmet_(Skyrim)). Why the creators made such a mouth at all is not clear.
Interestingly, the ancient Greeks did not have a mouth in the helmet at all. https://www.google.com/search?q=Greek+hoplite+helmet&rlz=1C1CHZN_ruUA957UA957&sxsrf=AJOqlzV8V8gH0_tT6sgabjklc0F4FhRzyg:1679338962299&tbm=isch&source=iu&ictx=1&vet=1&fir=Ai_AJqh8SgMhdM%252C55Sa0iVLzaOUrM%252C_%253BTWtYwKYaQJTyJM%252Cu1JTRui6iD6JkM%252C_%253B_DahSqGQINLdPM%252CVrfvU9DuTC8kJM%252C_%253BTvII4cTQJSWm5M%252CVy95qlaOli3vJM%252C_%253B6czYERnvKy0CHM%252Cq1tG8VJ8haU7cM%252C_%253BYtApaP2B8vhFwM%252C1IFeMWIfIf7IUM%252C_%253Bx8FDOATVQRLAPM%252CFL9_Axm0pDzXNM%252C_%253BLcY0P43TTx7aNM%252C8k4gu-32ODYGNM%252C_%253BjgZPRmYkw4ll7M%252C1A0WMZwejYrSqM%252C_&usg=AI4_-kSud7bLMN2GyB7sflJsLsqBZ2eXEA&sa=X&ved=2ahUKEwiGqriSmev9AhURposKHW6SCNsQ_h16BQiBARAB#imgrc=TWtYwKYaQJTyJM
3 comments
Why the creators made such a mouth at all is not clear.
https://www.google.com/search?q=Greek+hoplite+helmet&rlz=1C1CHZN_ruUA957UA957&sxsrf=AJOqlzV8V8gH0_tT6sgabjklc0F4FhRzyg:1679338962299&tbm=isch&source=iu&ictx=1&vet=1&fir=Ai_AJqh8SgMhdM%252C55Sa0iVLzaOUrM%252C_%253BTWtYwKYaQJTyJM%252Cu1JTRui6iD6JkM%252C_%253B_DahSqGQINLdPM%252CVrfvU9DuTC8kJM%252C_%253BTvII4cTQJSWm5M%252CVy95qlaOli3vJM%252C_%253B6czYERnvKy0CHM%252Cq1tG8VJ8haU7cM%252C_%253BYtApaP2B8vhFwM%252C1IFeMWIfIf7IUM%252C_%253Bx8FDOATVQRLAPM%252CFL9_Axm0pDzXNM%252C_%253BLcY0P43TTx7aNM%252C8k4gu-32ODYGNM%252C_%253BjgZPRmYkw4ll7M%252C1A0WMZwejYrSqM%252C_&usg=AI4_-kSud7bLMN2GyB7sflJsLsqBZ2eXEA&sa=X&ved=2ahUKEwiGqriSmev9AhURposKHW6SCNsQ_h16BQiBARAB#imgrc=TWtYwKYaQJTyJM