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Fluorine (#9) is the most electronegative and reactive of all elements. It is a pale yellow, corrosive gas, which reacts with practically all organic and inorganic substances.

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My birthday is on the 9/9 and fluorine has an atomic number of  9

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This is fluorine at a very cold temperature

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Melting point: -219° C
Boiling point: -188° C.
Density. 0.0017 g/cm³.
Appearance: Pale yellow gas.

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Most crests toothpastes have Tin(IV) fluorine in them

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Tin(IV) fluoride is a chemical compound of tin and fluorine with the chemical formula SnF and it is a colorless solid used as an ingredient in toothpastes as an alternative to sodium fluoride.

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Fluorine is the most reactive of all the elements. It reacts with almost all substances (even water burns in fluorine, products not a bright flame). It reacts with hydrogen to form hydrogen fluoride. When hydrogen fluoride is dissolved in water, it forms hydrofluoric acid. Fluorine is very poisonous.

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Hydrofluoric acid can dissolve glass and is used to etch the glass in light bulbs

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Lightbulb in hydrofluoric acid