serration vs teething

serration

noun
  • A set of teeth or notches. 

  • One of the teeth in a serrated or serrate edge. 

  • The state of being serrated. 

teething

noun
  • The eruption, through the gums, of the milk teeth; dentition. 

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