4 Pics 1 Word Level 820

Answer:
Filling
Hint
What is the answer to the 4 Pics 1 Word level with A person at the Dentist with their mouth opened, A slice of cake, A person handling a big machine, and A big sandwich on a roll?

Hint
What is the answer to the 4 Pics 1 Word level with A person at the Dentist with their mouth opened, A slice of cake, A person handling a big machine, and A big sandwich on a roll?