It's standard practice.
Alty
C T
CT
D003142:Communication; D003813:Dentistry; D015386:Hazardous Substances / Q000592:standards*; D006801:Humans; D016273:Occupational Exposure / Q000331:legislation & jurisprudence* / Q000517:prevention & control; D017751:Safety Management / Q000331:legislation & jurisprudence* / Q000592:standards; D014481:United States; D014489:United States Occupational Safety and Health Administration / Q000331:legislation & jurisprudence / Q000592:standards; D017132:Workplace / Q000331:legislation & jurisprudence / Q000592:standards
D015386:Hazardous Substances