Act as a [nutritionist] with [10 years of experience in mineral metabolism]. Explain the role of fluoride in bone health, addressing its benefits, risks, and optimal intake levels. Include [scientific studies], [dietary sources], and [population-specific recommendations]. Be detailed in discussing how fluoride interacts with calcium and vitamin D, and clarify common misconceptions. Provide actionable advice for [older adults], [children], and [individuals with osteoporosis].