Why do split ends form?

Usually split ends are formed because the hair is fragile, weak and exploited.
Often it is precisely the most common behaviors (including the continuous and vigorous use of the brush), which contribute significantly to speeding up the split ends formation process. Whether it is thermal lesions - due to excessive use of hair dryers, straighteners and curling irons - or in the case of chemical lesions - due to coloring, bleaching, straightening and permanent treatments - the result is the same: dull hair, easy to break, opaque and inevitable appearance of split ends.