Et tu,N2.
D005557:Formaldehyde / Q000009:adverse effects; D006801:Humans; D007854:Lead / Q000009:adverse effects; D012387:Root Canal Filling Materials / Q000009:adverse effects; D012390:Root Canal Therapy / Q000379:methods
D012387:Root Canal Filling Materials; D005557:Formaldehyde; D007854:Lead