Is it true that vitamin c can help repair your gums around your teeth?

If you have scurvy.: Scurvy:deficiency vitamin c deprivation for several weeks to months can cause spongy, swollen gums, tooth loss, bleeding around hair follicles, joint and bone pains, and more. Uncommon since the 1700s. (was treated with ration of lemon juice, or sauerkraut) 10 mg vitamin can treat it. Most people in us are not deficient. Aim for 5+svgs of fruits, veggies/day (try for 9-11).

Scurvy: Once you've developed periodontal disease i'm not certain that vitamin c will repair. However, this though is likely derived from a disease we rarely see anymore that is caused by a lack of vitamin c - scurvy. Among other symptoms, soft, bleeding gums and rotting/missing teeth occur. Interestingly, british navymen were called "limeys" because they were made to eat limes daily to prevent this.

Yes: Vitamin c is required for the normal health of the gums. Placing it on the gums will have no impact and unless you are low on vitamin c adding extra will have little impact. If you smoke, extra vitamin c can help with the healing but then it would be better to not smoke... If one can stop.

Only if the gum damage is caused by a lack of Vitamin C (Scurvy). But if you eat a well rounded diet, or take multivitamin daily, you don't have Scurvy, Most gum disease caused by bacteria. See your General Dentist or a gum/bone specialist Periodontist.