What is a potential sign of fluoride deficiency?

Fluoride is an essential trace mineral that plays a vital role in dental health by strengthening tooth enamel and preventing cavities. A potential sign of fluoride deficiency is the development of gray-brown spots on the teeth, known as dental fluorosis. This condition occurs when there is insufficient fluoride available during the formative years of tooth development. As a result, the enamel does not mineralize properly, leading to discoloration and structural defects.

Gray-brown spots are specifically associated with insufficient fluoride intake because fluoride helps in remineralizing the teeth and preventing decay. In contrast, swollen or bleeding gums and bruising due to skin bleeding are not symptoms tied to fluoride deficiency but are more commonly linked to issues such as vitamin C deficiency or other oral health problems. Similarly, symptoms like psoriasis, scaliness, and muscle pain relate to other nutritional deficiencies or health conditions but do not signify a fluoride deficiency. Thus, the presence of gray-brown spots on the teeth distinctly aligns with fluoride deficiency signs, making it the correct answer.