Overview
This study guide covers the essential nail care knowledge required for the Texas Cosmetology State Board Exam, administered under the Texas Department of Licensing and Regulation (TDLR). Topics include nail anatomy, common disorders and diseases, manicure procedures, sanitation requirements, and nail product chemistry. Mastering these concepts is critical for both client safety and passing your licensing exam.
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Nail Anatomy & Structure
Summary
The nail unit is composed of several distinct structures, each with a specific function. Understanding the names, locations, and roles of these structures is foundational to nail care and frequently tested on the state board exam.
Key Structures
• Nail Plate – The hardened, visible portion of the nail made of keratinized cells. It rests on the nail bed.
• Free Edge – The portion of the nail plate that extends past the fingertip or toe. This is the part shaped and filed during a manicure.
• Nail Matrix – The most critical structure; located beneath the base of the nail plate. It produces the nail plate and determines its thickness, shape, and growth rate. Contains nerves, lymph vessels, and blood vessels.
• Lunula – The whitish, half-moon-shaped area visible at the base of the nail plate. It is the visible portion of the matrix and appears white because the cells are not yet fully keratinized.
• Eponychium (Cuticle) – Living skin at the base of the nail plate that overlaps the lunula. It seals the space between the nail plate and surrounding skin to block pathogens.
• Hyponychium – Thickened skin located under the free edge, sealing the nail bed from bacteria and infection. Not to be confused with the eponychium.
• Lateral Nail Folds – Folds of skin on either side of the nail plate.
• Nail Bed – The skin beneath the nail plate that the nail rests on. Rich in blood vessels, giving nails a pinkish color.
Nail Growth Facts
• Fingernails grow approximately 3.5 to 4 mm per month
• Growth is influenced by age, health, nutrition, and season (faster in summer and on the dominant hand)
• Toenails grow more slowly than fingernails
Key Terms
• Keratinization – The process of nail cells hardening with keratin protein
• Nail unit – The collective term for all nail structures
• Nail groove – The tracks on the sides of the nail along which the nail plate grows
Watch Out For
> ⚠️ Exam Pitfall: Students often confuse the eponychium (living skin at the base) with the hyponychium (skin under the free edge). Remember: epo = above/base, hypo = under/below the free edge.
> ⚠️ Exam Pitfall: The lunula is part of the matrix — not a separate structure. Damaging the matrix permanently affects nail growth.
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Nail Disorders & Diseases
Summary
A cosmetologist must be able to identify nail conditions and determine whether it is safe and legal to perform services. The critical distinction is between a disorder (non-infectious; may work around) and a disease (infectious; must refer to a physician).
Disorders vs. Diseases – The Core Rule
| Type | Definition | Cosmetologist Action |
|---|---|---|
| Disorder | Caused by injury, nutrition, or illness; non-infectious | May perform service, working around affected area |
| Disease | Caused by bacterial, fungal, or viral infection; contagious | STOP – Refer to a physician. Do NOT perform service. |
Common Nail Disorders
• Leukonychia – White spots or streaks on the nail plate caused by minor injury to the matrix. These are trapped air pockets and will grow out naturally. (Service is safe.)
• Beau's Lines – Horizontal ridges or depressions across the nail caused by a temporary disruption of matrix activity (illness, high fever, nutritional deficiency, or surgery). (Service may be performed.)
• Onycholysis – Separation of the nail plate from the nail bed, beginning at the free edge. Causes include injury, allergic reaction, or infection. (Assess cause — if no infection, service may proceed with caution.)
• Onychocryptosis (Ingrown Nail) – The nail plate curves inward and grows into the lateral nail fold. Cosmetologists must NOT treat this condition — refer to a podiatrist or physician.
• Vertical Ridges – Common, non-infectious ridges running the length of the nail, often related to aging or dehydration.
Common Nail Diseases (Refer – Do NOT Service)
• Onychomycosis – Fungal infection of the nail. Characterized by discolored (yellow, brown, or white), thickened, brittle nails. Do NOT perform services. Refer to a physician.
• Paronychia – Bacterial infection of the skin surrounding the nail. Causes redness, swelling, and pus. Do NOT service — refer immediately.
• Tinea Unguium – Another term for fungal nail infection (same as onychomycosis).
Key Terms
• Onyx- – Prefix meaning "nail" (e.g., onychomycosis, onycholysis)
• -mycosis – Suffix meaning "fungal infection"
• -lysis – Suffix meaning "separation or loosening"
• -cryptosis – Suffix meaning "hidden" (as in the nail growing hidden/into the skin)
Watch Out For
> ⚠️ Exam Pitfall: Onychomycosis = automatic referral. No exceptions. Never perform any nail service on a nail with a suspected fungal infection.
> ⚠️ Exam Pitfall: Leukonychia (white spots) is a common exam question. These are NOT fungal — they are air pockets from minor trauma and are completely safe to work on.
> ⚠️ Exam Pitfall: An ingrown nail may seem like something a cosmetologist can "fix," but it is always referred to a medical professional.
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Manicure Procedures & Techniques
Summary
Proper manicure technique ensures client safety, product adhesion, and professional results. The state board tests both the correct order of steps and specific technical details such as filing direction and water temperature.
Basic Manicure Step Order
1. Remove existing nail polish
2. Cleanse and dehydrate the nail plate
3. Push back the cuticle (do not cut living tissue)
4. Shape/file the nail
5. Buff the nail surface (remove shine if needed)
6. Soak nails in warm water to soften cuticles
7. Apply cuticle remover if needed, re-push cuticles
8. Massage hand and arm
9. Re-cleanse and dehydrate nail plate (especially before enhancements)
10. Apply base coat → color → top coat
Nail Enhancement Preparation Order
> Remove polish → Cleanse/Dehydrate → Push back cuticle → Shape nail → Buff shine away → Apply primer/bonder (if required) → Apply enhancement product
Nail Shapes
| Shape | Description |
|---|---|
| Square | Filed straight across with sharp corners |
| Squoval | Straight across with slightly rounded corners — combination of square and oval |
| Oval | Gently curved along the sides, tapered at the tip |
| Round | Follows the natural curve of the fingertip |
| Almond | Tapered sides with a pointed tip |
| Stiletto/Pointed | Dramatically tapered to a sharp point |
Filing Technique
• Always file in one direction — from the side corner toward the center
• Never saw back and forth — this weakens the nail structure and causes splitting and peeling
Product Application Rules
• Base Coat – Protects natural nail from staining; improves polish adhesion; reduces chipping
• Top Coat – Seals color, adds shine, and extends wear
• Primer/Bonder – Used before enhancements to improve adhesion to the natural nail plate
Manicure Soak Temperature
• Warm water: 95°F to 105°F (35°C to 40°C)
• Hot enough to soften cuticles; cool enough not to burn the client
Key Terms
• Dehydration – Removing surface moisture and oils from the nail plate before enhancement application
• Cuticle remover – Chemical (usually alkaline) product that softens and loosens dead cuticle tissue
• Primer – Prepares the nail plate surface for enhancement product bonding
Watch Out For
> ⚠️ Exam Pitfall: Filing back and forth is incorrect technique. The board exam will test whether you know to file in one direction only.
> ⚠️ Exam Pitfall: Know the difference between base coat (protects + adheres) and top coat (seals + shines). They are not interchangeable.
> ⚠️ Exam Pitfall: Water that is too hot can burn the client. Water that is too cool won't soften cuticles effectively. Know the temperature range: 95°F–105°F.
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Sanitation, Safety & Texas Regulations (TDLR)
Summary
Texas cosmetology facilities are regulated by the Texas Department of Licensing and Regulation (TDLR). Proper sanitation protects both clients and cosmetologists from infection and is heavily tested on the state board exam.
The Three Levels of Decontamination
| Level | Method | Used For |
|---|---|---|
| Sanitation | Cleaning with soap/detergent; reduces germs | Countertops, bowls, surfaces — always the FIRST step |
| Disinfection | EPA-registered, hospital-grade chemical solution | Non-porous tools and implements (metal, glass) |
| Sterilization | Autoclave (high heat/pressure); destroys ALL organisms | Required in medical settings; not standard in salons |
Non-Porous (Reusable) Implements – Metal Tools
Examples: Metal cuticle pushers, nippers, tweezers
Correct Procedure:
1. Clean to remove all visible debris
2. Fully immerse in an EPA-registered, hospital-grade disinfectant
3. Leave for the manufacturer's recommended contact time
4. Remove, rinse, dry, and store in a clean, covered container
Porous (Single-Use) Implements – Must Be Discarded
Examples: Nail files, buffers, wooden pushers, foam toe separators
> These items absorb fluids and cannot be properly disinfected — they must be thrown away after a single client use.
Texas TDLR Key Rules
• All disinfectants must be EPA-registered and hospital-grade
• Disinfectants must be used at the correct dilution per manufacturer instructions
• Contact time (how long the implement stays in the solution) must be followed precisely
• Wet disinfectant containers must be covered when not in use
• Do not perform services over open wounds, cuts, or abrasions
• Clients with infectious nail conditions must be referred to a physician
Open Wounds – Safety Protocol
If a client has an open cut or abrasion:
• Do NOT apply any products directly on or near the open wound
• Avoid the area entirely to prevent cross-contamination
• If the wound is significant, consider rescheduling the service
Key Terms
• EPA – Environmental Protection Agency; registers approved disinfectants
• Hospital-grade disinfectant – Kills bacteria, fungi, and viruses; required in Texas salons
• Contact time – The amount of time an implement must remain in disinfectant solution to be effective
• Cross-contamination – Transfer of pathogens from one person or surface to another
Watch Out For
> ⚠️ Exam Pitfall: Porous = single-use, always discard. Files and buffers are NEVER disinfected and reused — this is a frequent exam question.
> ⚠️ Exam Pitfall: Sanitizing is NOT the same as disinfecting. Sanitation (cleaning) always comes first, but it is not enough on its own for implements.
> ⚠️ Exam Pitfall: Always follow manufacturer's contact time — leaving implements in solution for less time than directed does not properly disinfect them.
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Nail Products & Chemistry
Summary
Understanding the chemical properties of nail products ensures safe application, correct product selection, and protection of nail enhancements.
Acetone
• Primary chemical in traditional nail polish remover
• Highly effective solvent — dissolves oils, polish, and enhancement products
• Dissolves acrylic and gel nail enhancements — use with extreme caution around clients with nail enhancements
• Non-acetone removers should be used on clients wearing enhancements to prevent damage
Acetone vs. Non-Acetone Remover
| Feature | Acetone | Non-Acetone |
|---|---|---|
| Strength | Stronger/faster | Milder/slower |
| Use with enhancements | ❌ Damages acrylics and gels | ✅ Safer for enhancement clients |
| Skin effect | More drying to skin and nails | Less drying |
Common Nail Product Categories
• Nail Polish/Lacquer – Colored film-forming product applied to the nail plate
• Base Coat – Applied first; protects nail and improves adhesion
• Top Coat – Applied last; seals and protects color
• Cuticle Oil – Moisturizes and conditions the cuticle and surrounding skin
• Nail Hardener – Strengthens weak or thin nail plates
• Primer – Applied before acrylics or gels to improve bonding
• Monomer/Polymer – Liquid and powder components of acrylic nail enhancements
Key Terms
• Solvent – A substance that dissolves another substance (acetone is a solvent for nail polish)
• Adhesion – The ability of a product to bond to the nail surface
• Monomer – The liquid component in acrylic systems
• Polymer – The powder component in acrylic systems
Watch Out For
> ⚠️ Exam Pitfall: Acetone is safe for removing natural nail polish but will damage or dissolve acrylic and gel enhancements. Know when to use each type of remover.
> ⚠️ Exam Pitfall: Products must be used as directed. Primers are used before enhancement products — not instead of base coat for natural nail polish.
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Quick Review Checklist
Use this checklist in your final review before the exam:
Nail Anatomy
• [ ] I can name and describe the function of: nail plate, free edge, matrix, lunula, eponychium, and hyponychium
• [ ] I know that the matrix produces the nail plate and controls its growth
• [ ] I can distinguish the eponychium (base) from the hyponychium (under free edge)
• [ ] I know fingernails grow 3.5–4 mm per month
Nail Disorders & Diseases
• [ ] I can distinguish between a disorder (may service) and a disease (refer to physician)
• [ ] I know onychomycosis is fungal and requires a physician referral — no service
• [ ] I know leukonychia (white spots) is safe to work on
• [ ] I know Beau's lines are caused by illness or nutritional disruption
• [ ] I know ingrown nails (onychocryptosis) require a physician/podiatrist referral
Manicure Procedures
• [ ] I know the correct order of manicure steps
• [ ] I know to file in one direction only — never sawing back and forth
• [ ] I know the base coat protects and adheres; top coat seals and shines
• [ ] I know soak water temperature: 95°F–105°F
Sanitation & Texas Regulations
• [ ] I know metal implements must be cleaned then immersed in EPA-registered, hospital-grade disinfectant for full contact time
• [ ] I know porous implements (files, buffers) must be discarded after one client
• [ ] I know **three levels