Assertion: filling | /r/HasAspect | finite lifespan
Facets:
Source sentences:
text: A 2003 study showed that fillings have a finite lifespan: an average of 12.8 years for amalgam and 7.8 years for composite resins.  
text: Fillings have a finite lifespan; composites appear to have a higher failure rate than amalgam over five to seven years.