Answer: Fluoride
Step-by-step explanation:
Because of Angela's trouble with her teeth and bones, she needs to increase her intake of fluoride.
Fluoride can be found in our bones and teeth and we can find it also in water, plants, rocks, air and more.
It is used in dentistry and medicine. It is safe to use but it can cause side effects if it is used in large doses but most people are considering fluoridated water as the cause of health problems such as bone cancer.