The Complete Guide to Pedicure Files
Foot and Nail Files: how to choose the ideal grit for each procedure
Why does file selection matter?
Files used in podiatry are abrasive accessories developed to promote controlled wear of the skin or nail plate. While foot files are intended for removing hyperkeratosis, calluses, and dry skin, nail files are used to reduce thickening, smooth surfaces, finish, and prepare the nail for procedures such as nail reconstructions or orthosis application.
Choosing the correct grit directly influences the efficiency of the procedure, patient comfort, and the preservation of healthy tissues.
General Comparison
| Characteristic | 🟦 Foot File | 🟨 Nail File |
|---|---|---|
| Area of action | Plantar skin and heel | Nail plate |
| Main purpose | Remove hyperkeratosis and calluses | Reduce thickness, shape, and finish the nail |
| Equipment | Micromotor + mandrel + sanding disc | Micromotor + mandrel or specific holder |
| Abrasiveness | High | Medium to fine |
| Use on skin | ✅ Yes | ❌ No |
| Use on nails | ❌ No | ✅ Yes |
Grit Comparison
| Grit | Abrasiveness | 🟦 Foot File | 🟨 Nail File |
|---|---|---|---|
| 80 | Very high | Intense hyperkeratosis and thick calluses | Not indicated |
| 120 | High | Moderate calluses and dry heels | Initial reduction of very thick nails (with caution) |
| 180 | Medium | Maintenance and intermediate finishing | Reduction of nail thickness |
| 240 | Medium/Fine | Skin finishing | Nail plate finishing |
| 320 | Fine | Final polishing | Nail polishing |
| 400 | Very fine | Not routinely used | Fine finish and preparation for nail reconstruction |
| 600 | Extra fine | Not indicated | Polishing of natural and reconstructed nails |
| 800–1200 | Ultra-fine | Not indicated | High-gloss polishing and cosmetic finishing |
Note: Available grits may vary between manufacturers and disc or file systems.
When to use each grit?
| Procedure | Recommended grit |
|---|---|
| Intense hyperkeratosis | 🟦 80 |
| Plantar callus | 🟦 80 or 120 |
| Dry heel | 🟦 120 |
| Plantar skin maintenance | 🟦 180 |
| Plantar finishing | 🟦 240 |
| Skin polishing | 🟦 320 |
| Nail thickness reduction | 🟨 180 |
| Nail plate regularization | 🟨 240 |
| Preparation for nail reconstruction | 🟨 320–400 |
| Final nail polishing | 🟨 600–1200 |
Comparison by application
| Clinical situation | Indicated file | Grit |
|---|---|---|
| Plantar callus | 🟦 Foot | 80 or 120 |
| Hyperkeratosis | 🟦 Foot | 80 |
| Superficial fissures | 🟦 Foot | 180 |
| Foot finishing | 🟦 Foot | 240 or 320 |
| Onychogryphosis (thickened nail) | 🟨 Nail | 120 or 180 |
| Onychomycosis with thickening* | 🟨 Nail | 180 |
| Nail plate leveling | 🟨 Nail | 240 |
| Nail reconstruction | 🟨 Nail | 320 or 400 |
| Nail polishing | 🟨 Nail | 600 or higher |
* Mechanical reduction of nail thickness can be part of podiatric management, always according to clinical evaluation and adopted protocols.
💡 Dental Access Best Practices
Wear should be progressive, starting, when necessary, with more abrasive grits and moving to finer grits, both on the skin and on the nail. Disposable sanding discs must be replaced for each patient, following biosafety protocols and preventing cross-contamination.
Flowchart — How to choose the file and grit
|
🟦 PLANTAR SKIN
The lower the number → the higher the abrasiveness |
🟨 NAIL PLATE
Always progress from coarser to finer |
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Disposable discs must be replaced for each patient according to biosafety protocols.
Quick guide by procedure
| Procedure | File | Grit |
|---|---|---|
| Plantar hyperkeratosis | Foot | 80 |
| Callus | Foot | 120 |
| Skin finishing | Foot | 240 |
| Skin polishing | Foot | 320 |
| Nail thickness reduction | Nail | 180 |
| Preparation for orthosis | Nail | 240 |
| Nail reconstruction | Nail | 320–400 |
| Final nail polishing | Nail | 600–1200 |
Myths and Facts
| Statement | Myth or Fact? | Explanation |
|---|---|---|
| The lower the grit number, the higher the abrasiveness. | ✅ Fact | 80-grit files remove more material than 320-grit ones. |
| The same file can be used on skin and nails. | ❌ Myth | Each type is developed for a specific structure and purpose. |
| It is possible to use different grits in the same session. | ✅ Fact | Progression of grits improves finishing and wear control. |
| Disposable discs can be reused after cleaning. | ❌ Myth | They must be discarded after each patient to prevent cross-contamination. |
| Very fine grits are indicated for polishing and finishing. | ✅ Fact | They are used to uniform the surface and provide a more delicate finish. |
💡 In Clinical Practice
Although they use the same equipment (micromotor and mandrel), foot and nail files perform different functions. Foot files work on keratinized skin tissues and therefore use more abrasive grits to remove calluses and hyperkeratosis. Nail files, on the other hand, are designed for controlled wear of the nail plate, using progressively finer grits to reduce thickness, prepare for reconstructions, and perform final polishing. Knowing this difference and correctly selecting the grit for each step of the procedure contributes to safer, more precise care with better aesthetic and functional results.
