A 4-year-old child lives in a community that has adequate fl…

A 4-year-old child lives in a community that has adequate fluoride concentration. Because their teeth are still developing, and permanent teeth have not yet erupted, the parent should provide additional fluoride supplements at what ppm level? 0.25 mg/day 0.5 mg/day 1.0 mg/day 0 mg/ day (no supplements needed)