I would be very surprised if Canon had sought FDA approval! Presumably it would have to be under the rubric of "cosmetics", where interestingly colouring agents are a special case. On the FDA site you'll find this:
FDA does not have the legal authority to approve cosmetic products and ingredients (other than color additives) before they go on the market. We also do not have a list of tests required for any particular cosmetic product or ingredient. However, a manufacturer or distributor of a cosmetic is legally responsible for ensuring that a marketed product is safe when consumers use it according to the directions in the labeling or in the customary or expected way. FDA can take action against the manufacturer of a cosmetic on the market if we have reliable information to show that a cosmetic does not meet the legal requirement for safety.
The law treats color additives differently. Unlike other cosmetic ingredients, color additives, other than coloring materials used in coal-tar hair dyes, must be approved by FDA for the specific intended use before they are permitted in any cosmetic.