Depaltors Flashcards
Is a term applied to any preparation (powder, liquid, cream or paste) designed for the removal of unnecessary hair (in particular, hair occurring on the face, legs and axilla) without causing injury to the skin.
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It is distinct from epilatory or hair destruction by hair pull out using tweezers, waxy and adhesives or electrolysis.
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Mechanism of action
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Depilatory preparations usually contain a strongly …..
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These cause degradation of hair keratin and deterioration of hair fibers because of the ……
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The pH of chemical depilatories usually falls between 10 and 12.5
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The jelly-like mass produced can be easily removed by ……
L
As the epidermis is also rich in keratin, the skin
may become irritated and sensitive if …..-
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….. are used primarily for the
arms and legs
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They should not be used on the face unless specifically listed for that purpose on the product’s label.
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Requirements for ideal depilatory product:
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Nontoxic
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nonirritant
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Remove hair rapidly, preferably in 4-6 min.
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Preferably odourless
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Stable on storage
L
Harmless to clothing
L
Exhibit cosmetic elegance
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Depilatory active reagents
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Sulfides
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Sodium sulfide
;
Strontium sulfide
L
too drastic in action (2% aqueous solution have a pH 12)
O
It will disintegrate hair within 6-7 min but it will simultaneously damage the stratum corneum.
K
Their depilatory action is linked to their….
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sulfhydrates
L
sodium hydroxide.
K
is a much milder one but must be used at a higher concentration than sodium sulfide.
O
Sulfide products are unpopular because they…
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The odour is most intense when the product is …….
L
➢It is advisable, therefore to remove the bulk of the product with a spatula before washing.
0
O
Substituted mercaptanes (thioglycolates)
L
The majority of depilatory available today belong to this group
O
calcium thioglycolate.
O
These are used in presence of alkaline reacting material
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the resulting combination of calcium hydroxide and thioglycolic acid
L
They act by the same mechanism (breaks down the disulfide bonds in keratin and weakens the hair so that it is easily scraped off).
O
These possess less …… than the sulfide type but take …. time to act.
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They are ….. on skin than sulfide and can be used on face and also to smooth the leg.
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They are non toxic and stable at use concentration (about 4%)
0
Need 5-15 min to act depending on the pH of the preparation and it should be between 10-12.5 to produce depilation
P
Enzymes-
P
Based on the enzyme keratinase.
O
Nonirritating
P
odourless
L
acts by digesting keratin.
K
They are not commercial because they are extremely slow
I
Frequently asked questions:
J
What is the difference between a depilatory and epilatory?
O
removes hair on the skin’s surface.
U
is the mechanical removal of hair by any method such as waxing or tweezing (plucking).
J
This removes the hair from below the skin’s surface taking out the hair follicle.
O
….. is painful and may cause skin damage and subsequent infection.
P
How does a depilatory work?
L
Depilatories contain chemicals with a ….. degree of alkalinity such as sodium sulfide, or calcium thioglycolate.
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They react with the protein structure of hair breaking it down.
L
Depending on the coarseness of hair, within 5 to 15 minutes, the hair is dissolved into a gloopy mass which can then be washed away.
L
Why does skin feel so smooth after applying a depilatory?
O
acts as an exfoliant
P
it removes dead skin cells on the surface of the skin. These dead skin cells accumulate every day and they often feel rough. After removal, the skin feels softer and smoother.
O
Many depilatories contain moisturizers such as ……….which contribute to softer smoother skin.
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Baby Oil
K
Almond Oil
L
Green Tea
L
Aloe
L
Which is best - a depilatory cream or liquid?
L
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is designed for larger areas of the body such as the legs, underarms and bikini area.
P
is therefore ideal for the face.
L
A depilatory cream has a thicker consistency so it can be applied to specific areas without the risk of running on to skin you don’t want treated.
L
How long do the results last?
L
This varies with the individual but usually for many days even up to around two weeks.
L
Generally the results last longer than using a razor.
L
This because the chemicals in the depilatory reach down into the pores of the skin thus removing hair below the level of the skin. As a result, the hair takes longer to grow back.
K
What are the pros and cons of depilatories?
I
Pros
L
Cons
O
no cutting or abrading skin especially in unseen area
discourage the regrowth of hair if they reapplied regularly
10. results vary widely
0
by gradual removal of keratinous debris from the mouth of the hair follicle
O
Various strength products available to dissolve even the strongest of hairs
P
offer skin smoothness
L
easy to apply, widely available OTC.
L
local damage to skin if they are used improperly
L
possible allergic skin reaction,
L
L
messy application
O
unpleasant odor
O
results vary widely
L
