Botox has proved to be a little poison with unlimited health and beauty potential. A few precious drops can manage everything from frown lines, worry lines, upper lip creases, and neck cords, to excessive sweating and migraines.

Botox is a trade name for botulinum toxin A. In this way, Botox is related to botulism. Botulism is a form of food poisoning that occurs when someone eats something containing a neurotoxin produced by the bacterium Clostridium botulinum. Botulinum toxin A is one of the neurotoxins produced by Clostridium botulinum.

Basically, the botulinum toxins block the signals that would normally tell your muscles to contract.

Where it works
Vertical lines between the brows
Lines at the bridge of the nose
Crow's feet or squint lines
Horizontal forehead lines
Lifting the droopy nasal tip
Under eyelid creases, muscle rolls
Decollete lines, neck bands
Chin creases and dimples
Drooping corners of the mouth
Upper and lower lip lines

How Botox works

The toxin acts on the junctions between nerves and muscles, preventing the release of a chemical messenger, acetylcholine, from the nerve endings. Tiny amounts are injected into a specific facial muscle so only the targeted impulse of that muscle is blocked, immobilising the underlying cause of unwanted lines-muscle contractions- and prevent lines and wrinkles. Since the muscle can no longer make the offending facial expression, the lines gradually smooth out from disuse and new creases are prevented from forming. Untreated muscles are not affected, so a natural look expressions are maintained. Some areas are less suited to this procedure because the muscles are needed for expression and important functions like eating, kissing and opening the eyes. The goal is a softening of dynamic facial lines that won't necessarily betray your wrinkle-reducing secret. There are various strains of Botulinum toxin. Type A is the potent and commonly used.

After Botox injection, the muscles will relax and the skin will smooth out over about 5 days. The effect usually lasts about six months, and
can be repeated when needed.

Remember

Have your first treatment with someone who comes highly recommended and has a lot of experience, so that you will know that is acceptable.
Start small with one area, typically the lines between the brows of crow's-feet. Once you see the results, you can have more areas worked on at your worked on at your next treatment.
If you are squeamish about needles, ask your doctor for a topical anaesthetic cream or gel.

To relieve the discomfort of the injections, apply an ice pack before and after treatment.
If your treatment didn't work, you may have been given an overly diluted solution and need more, or it could have been injected into the wrong spot. It is exceedingly rare to be resistant to it.

Take along a concealer to cover needle marks or tiny bruises right after treatment. Have your Botox treatment at least a weak before any big social event.

Don't have a treatment without having eaten to avoid getting lightheaded.

Botulinum toxin isn't the answer for all your wrinkles. It doesn't work as well on lines that are not entirely caused by muscle activity, like the nasal labial folds that are formed by a combination of muscle action and the weight of sagging skin.

Side Effects

If side effects occur, they’re usually temporary starting within the first week, but may persist for several months. The kinds of side effects depend on where Botox is injected. For patients with frown lines, the most common side effects include
Headache
Respiratory infection
Flulike symptoms
Droopy eyelids
Nausea
Less frequent reactions include facial pain, redness at the injection site, and muscle weakness.

FDA has approved Botox for other conditions such as:

Spasms of the muscle close to the eye (blepharospasm)
Inability of the eyes to work together properly (strabismus)
Involuntary contractions of neck muscles (cervical dystonia)
Frown lines between the eyebrows

Botox can be used by almost anyone: patients who are pregnant, breastfeeding or who have a neurologic disease should not use Botox