Assertion: mastodon's molar | /r/HasProperty | lost by the age of 6–7 years
Facets:
Source sentences:
text: The second molars start protruding at the age of about six months, grow to a size of 4 cm (1.6 in) wide by 7 cm (2.8 in) long and are lost by the age of 6–7 years.