The Journal — Page 4
Research-backed articles on lipid science, oral care, skincare and the ingredients behind every CallNature formula.
Nails
How Do I Know If My Gel Polish Has TPO in It? The Label-Reading Guide
The only reliable way to check for TPO in gel polish is to identify the INCI name and CAS number. Learn how to…
Dental Health
Is Hydrated Silica in Toothpaste Safe? RDA, Enamel Wear, and What the Abrasivity Charts Don't Tell You
Is hydrated silica in toothpaste a concern? Review RDA levels, enamel-wear evidence, and how abrasivity varies…
Skin / Anti-aging
Why Does One Side of My Face Have More Wrinkles Than the Other?
Why does one side of your face have more wrinkles? Compare sleep, sun, phone, and chewing habits, then use a p…
Dental Health
Can Tonsil Stones Cause Bad Breath? How to Tell If They're Behind Yours
Tonsil stones are a hidden cause of bad breath. Learn how to tell if they are the source, how to safely remove…
Dental Health
Can Black Triangles Between Your Teeth Fill Back In Naturally?
Can black triangles between your teeth close naturally? Learn the dentist-informed perspective, the scientific…
Scars & Stretch Marks
Why Do I Get Stretch Marks on My Shoulders From Working Out? (And What Actually Fades Them)
Stretch marks on shoulders from lifting are common. Learn the dermatology-backed reasons, how to track them, a…
Nails
Do Nails Really Need to Breathe? The Truth About Polish Breaks (and When You Actually Need One)
Nails do not breathe; they receive nutrients from the blood. Learn what a polish break actually does and how t…
Dental Health
Is Cocamidopropyl Betaine in Toothpaste Safe — or Just a Gentler SLS?
Cocamidopropyl betaine is often used as a gentler alternative to SLS. Review what oral research suggests about…
Skin / Anti-aging
Cacay Oil vs Rosehip Oil: Which Is Better for Aging Skin? (And the "Natural Retinol" Myth Both Sides Get Wrong)
Cacay oil and rosehip oil compared: review their fatty-acid profiles, vitamin content, and why the natural ret…
Skin / Anti-aging
Why Do I Have Smoker's Lines If I Don't Smoke? The 4 Real Causes (and What Helps)
Vertical lip lines can occur in non-smokers. Discover the causes of these wrinkles, self-check steps, and what…
Dental Health
Why Does My Breath Smell Metallic? The 6 Real Causes — and How to Tell If It's Your Gums
Metallic breath is often caused by iron in the blood from inflamed gums. Discover the real reasons for this ta…
Dental Health
Why Is My Gum Receding on One Tooth Only? The 7 Causes — and How to Tell Which One You Have
Gum recession on one tooth is usually caused by localized factors rather than general disease. Use a self-chec…
Scars & Stretch Marks
Why Do My Stretch Marks Itch When I'm Losing Weight? (And How to Calm It)
Losing weight and your stretch marks won't stop itching? Here's the dermatology-backed reason, a healing-stage…
Nails
Why Won't My Nails Grow Past a Certain Length? (The Grow-vs-Break Equilibrium)
Nails rarely stop growing; they often break as fast as they grow. Understand the math of growth versus breakag…
Dental Health
Does Glycerin in Toothpaste Block Remineralization? What the Evidence Actually Says
The claim that glycerin in toothpaste blocks remineralization lacks clinical support. Review what the research…
Dental Health
Is Titanium Dioxide in Toothpaste Safe to Swallow? What the Evidence Says
Is titanium dioxide in toothpaste a concern? Review conclusions from health organizations, how exposure is ass…
Skin / Anti-aging
Are Sleep Wrinkles Permanent? How to Prevent Sleep Lines on Your Face
Sleep wrinkles may start as temporary lines and deepen with age. Learn how side-sleeping contributes, how to i…
Dental Health
Why Can't I Smell My Own Bad Breath? (And How to Actually Check)
You cannot smell your own breath due to nose-blindness. Understand the science of why this occurs and the most…
Dental Health
Where to Buy Dental Pro 7: The Official Store, and Why It's Not on Amazon
Dental Pro 7 is sold only through official websites like callnature.com. Learn how to identify these authorize…
Nails
Should You Buff the Ridges Out of Your Nails? Why Nail Experts Say Don't
Buffing nail ridges can thin the nail plate and increase splitting risk. Learn what ridges are and why experts…
Dental Health
Why Do My Teeth Look Longer After a Deep Cleaning? (And Will My Gums Come Back?)
If your teeth look longer after a deep cleaning, learn why this happens, whether gums can return, the healing …
Scars & Stretch Marks
Why Is My Scar Still Red — and How Long Does Scar Redness Last?
A red scar is typically a sign of active healing. Learn how long this redness usually lasts based on scar type…
Nails
Does Nail Hardener Actually Weaken Your Nails? The Formaldehyde Paradox
Formaldehyde nail hardeners may strengthen nails initially but often lead to brittleness. Learn the science an…
Dental Health
Why Does My Breath Still Smell After Brushing and Flossing?
Breath still smells despite brushing and flossing? Explore 7 common hidden reasons why odor persists and a pla…