Calcium fluoride does not actually occur naturally in the human body and as such doesn't really contain a function. Outside of the body it is used in the production of materials.
Yes, because toothpaste contains fluoride which is poison to the human body. (If you swallow a big amount of toothpaste or drinks that include fluoride go to a doctor, if you swallow a little bit of fluoride you will be fine).
Fluoride is only used by the body when it is in direct contact with teeth, they help fight caries in the earlier stages. There can also be some minor benefit to bone structure. Fluoride itself is not stored by the human body, because it is not a nutrient, it is an activating agent. Fluoride is toxic to the human body and ingesting fluoride will not help the teeth, instead it will be a strain on the body and consuming large amounts of fluoride will kill you. So don't eat toothpaste or drink mouthwash containing fluoride. Fluoridated water poses no health risk because of the low concentration, but can significantly improve dental health - especially in low-income areas. In other areas fluoride is present enough (in tooth-paste and other sources) to render the fluoridation of drinking water useless.
Enamel, it is the hardest substance in the human body.
Fluoride helps to prevent tooth decay by strengthening tooth enamel and making it more resistant to acid attacks from plaque bacteria and sugars in the mouth. It can also reverse early stages of tooth decay by remineralizing the enamel.
The majority of fluoride in the body is stored in bones and teeth. About 99% of the body's fluoride is found in these tissues, where it helps to strengthen and protect them.
The Skeleton.
Fluoride can enter your body through drinking fluoridated water, consuming foods and beverages made with fluoridated water, using fluoride toothpaste, or receiving fluoride treatments at the dentist. It can also be present in some medications and supplements.
Trace elements in the human body include elements such as iron, copper, zinc, selenium, iodine, fluoride, manganese, and chromium. These elements are required in very small amounts but are essential for various biological functions in the body.
Fluoride is considered a trace mineral. It is required by the body in very small amounts for dental health, but excessive intake can be harmful and lead to fluoride toxicity.
Fluoride helps to strengthen tooth enamel and prevent tooth decay by remineralizing the teeth. It can also be incorporated into bone tissue, making them stronger and more resistant to fractures. However, excessive fluoride intake can lead to dental fluorosis or skeletal fluorosis, which can cause discoloration of teeth or bone abnormalities.
Ingesting large amounts of sodium fluoride can be harmful to your body, especially to your bones and teeth. However, it is commonly used in dental products like toothpaste to prevent cavities and is safe when used as directed. It is not typically harmful to your skin unless you have a specific sensitivity or allergy.