So, you can treat your dry lips with sugar lip scrub as it is a big depository of skin -beautifying qualities if used topically on the skin as an exfoliating scrub. It has moisturizing properties that prevent the skin from drying and also unclogs the clogged pores and removes dead dry skin.
Lack means that something is missed or wanted, and thereof is an adverb which makes reference to something previously mentioned; it means of that or it.
The definition of weak is lacking in strength. An example of weak used as an adjective is a weak argument which means an argument that has no evidence to back it up. lacking in strength of body or muscle; not physically strong. lacking vitality; feeble; infirm. lacking in skill or strength in combat or competition: a weak team.