Are split ends reversible?
Alas, but if the ends of the hair have already split, you can fix it only with a good haircut. Use a professional tool like these https://www.japanscissors.com.au/collections/kamisori-shears-for-sale to keep your hair healthy for a long time.
No. Think of your split ends, like the branch on a tree, after a huge storm. Are they reversible? Nothing can be done to the tree, except to cut them. Split ends also is caused by brushing your hair when it’s wet. Your hair brush should just glide, you’ll hear it snapping when they break while you brush. Spend 5-10 mins. trimming your hair strand per strand, section by section when the sun is shinning so you’ll understand how the hair is split in several places, and not always at the same length. Do it yourself trim, is the best. Use a 2″ folding shears for trimming. No other hair product can reverse the damage caused by tools & chemicals. It is more lethal if your hair is combined with dyeing & perming.