Vitamin C (ascorbic acid) plays a significant role in oral and dental health, with its effects being primarily supported by scientific evidence. Vitamin C is essential for collagen synthesis, a protein that is a major component of gum tissue, dentin, and other supporting structures of the teeth. Deficiency in vitamin C can lead to scurvy, which is characterized by swollen, bleeding gums, tooth mobility, and eventually tooth loss. Numerous observational studies have shown that individuals with low vitamin C intake are at higher risk for periodontal (gum) disease. Some interventional studies suggest that improved vitamin C intake can reduce gingival bleeding and inflammation, although the evidence for a direct effect on preventing dental caries (cavities) is limited.

While vitamin C is not a substitute for good oral hygiene or professional dental care, its role in maintaining the integrity of oral tissues and in wound healing is well documented. The link between vitamin C deficiency and poor gum health is well established, granting scientific support to its use for the "teeth body system," particularly in maintaining healthy gums and supporting healing. However, there is less direct evidence for a preventative or therapeutic effect on tooth enamel or caries.

In summary, the use of vitamin C to support oral health, particularly gums and connective tissues around teeth, is justified by scientific evidence, though its role in protecting against cavities is less clear.