Opt is short for option. To opt in is to accept or join; to opt
out is to decline or reject.
Opt-in means that you are only on a list or in a group if you
specifically ask to be. Opt-out means that you are on the list or
in the group unless you specifically ask not to be.
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There is no scientific method to grow hair that fast
unfortunately. You can always opt to add length by the use of
extensions - clip ins or semi permanent ones (fusion, micro ring,
etc)