What does the presence of milk, calcium, or magnesium tablets help with in fluoride toxicity?

The presence of milk, calcium, or magnesium tablets is significant in cases of fluoride toxicity primarily because they help minimize the absorption of fluoride in the gastrointestinal tract. This occurs because calcium and magnesium can bind to fluoride ions and form insoluble complexes, thereby reducing the amount of free fluoride available for absorption into the bloodstream. By preventing fluoride from being absorbed, the potential systemic effects of fluoride toxicity can be reduced, making it a crucial intervention in such scenarios.

While other options touch on aspects of digestion and elimination, they do not directly address the primary mechanism of action that calcium and magnesium serve in mitigating fluoride's harmful effects when ingested in excess.