hairbrush vs toothbrush

hairbrush

noun
  • A brush used in hair care for brushing, tidying, and detangling hair 

verb
  • To spank with a hairbrush. 

toothbrush

noun
  • A brush, used with toothpaste, for cleaning the teeth. 

verb
  • To clean or scrub with a toothbrush. 

How often have the words hairbrush and toothbrush occurred in a corpus of books? (source: Google Ngram Viewer )