FLEX disc is safe to try by anyone with a period. We have customers who are virgins and teens as young as 12 that use FLEX! That said, young teens that are particularly petite or smaller for their age may not be the best candidate.
We also recommend FLEX disc for young adults who are comfortable with their bodies since it sits at the base of the cervix and is inserted without the use of an applicator. This means that if you aren't familiar with tampons or other internally worn menstrual products, it may be beneficial to discuss FLEX as an option with your parent or guardian first. You can also ask the opinion of your doctor!
Another thing to consider is that FLEX can tear the hymen. However, it's really important to note that the hymen is often "broken" through natural physical activity like running or riding a bike, or by using a menstrual cup or tampon. Some people rarely notice when it happens and some don't have a very pronounced hymen to begin with.