If you’re a woman in your late 30s to early 50s and you’ve started waking up at 3 AM for no reason, or your gums are bleeding when they never used to, or you’re clenching your jaw so hard your teeth hurt — and you have no idea why everything seems to be changing at once — keep reading.
I’ve written before about how declining estrogen changes your gums, your saliva, your sleep, and your airway — and shared 22 small changes to protect your mouth in perimenopause.
What I haven’t gone deep enough on is the mineral that sits at the center of almost all of it — and why so few doctors are bringing it up.
And if you’re reading this thinking perimenopause doesn’t apply to me yet — it might already. Most people picture menopause as something that happens in your 50s. But perimenopause — the years-long hormonal shift leading up to it — most commonly begins in your early-to-mid 40s, and for some women, even in the late 30s.
That means if you’re 38, 42, 45, your estrogen may already be quietly declining. You might not feel it yet. But your gums, your saliva, and your sleep might already be changing.
My three daughters are in their early-to-late 30s now. This is the list I made for them — the 5 things I want them to start before they ever notice a symptom.
Number one is the one nobody’s prescribing…
1. Magnesium
This shouldn’t even be called a supplement. It’s essential — meaning your body literally cannot function without it.
Magnesium is involved in over 300 enzymatic reactions in your body, including estrogen metabolism. Read that again. Your body needs magnesium to process and use estrogen. When you’re already losing estrogen in perimenopause, being low in the mineral that helps your body use what’s left? That’s a problem.
In 40 years of private practice, these were the patterns I saw over and over in my perimenopausal patients:
- Clenching and grinding at night (the masseter is one of the strongest muscles in your body — magnesium helps it relax). One important caveat here: clenching and grinding can also be a sign of sleep-disordered breathing, and women are massively underdiagnosed for conditions like UARS and obstructive sleep apnea — some estimates suggest over 90% of women with sleep apnea go undiagnosed because the symptoms look different in women. If you’re clenching, magnesium is a great place to start, but please also find a dentist trained by the AADSM who can screen your airway. This matters.
- Dry mouth — magnesium supports salivary gland function, and your saliva is already declining as estrogen drops. A double hit.
- Poor sleep — and I don’t just mean trouble falling asleep. I mean the 3 AM wake-ups, the racing heart, the inability to get back to deep sleep. Magnesium calms your nervous system in a way melatonin simply doesn’t.
- Weaker bones — including your jawbone. Magnesium is required for calcium to actually integrate into bone tissue. Without it, calcium doesn’t go where you need it.
The cruel part is that stress burns through magnesium. And perimenopause is one of the most physiologically stressful transitions your body goes through. So you need more magnesium at exactly the moment your body is burning through it fastest.
You do NOT need to wait for a deficiency diagnosis to benefit. Most people aren’t getting enough magnesium from food alone, especially under stress. This isn’t about fixing something that’s broken. It’s about giving your body what it needs to function at its best during one of the most demanding transitions it will ever go through.
>> This is the best magnesium on the market — and the one I’ve told all three of my daughters to start now, before perimenopause hits.
2. Vitamin D3 + K2 (together — this matters)
Vitamin D helps your body absorb calcium. But without K2 directing that calcium into your bones and teeth, it can end up deposited in your arteries and soft tissues instead. K2 is the traffic cop.
This matters even more in perimenopause, because estrogen was helping keep calcium in your bones — and now that job is falling to D3 and K2.
Magnesium is required to convert vitamin D into its active form. Don’t go through all the effort of taking D3 if you’re not also going to take K2.
>> This is why I make sure to always supplement D3 + K2 together.
3. Electrolytes
Your saliva is not just water. It’s a mineral-rich fluid that protects your teeth, buffers acids, and fights bacteria. When saliva production drops in perimenopause (because your salivary glands have estrogen receptors and are losing their signal), the saliva you do produce needs to be as mineral-dense as possible.
Electrolytes help. I add them to my water every day — not for athletic performance, but for my teeth and my saliva.
>> This is the cleanest electrolyte on the market (that I’ve found, anyway) and tastes like lemon water. I drink one packet a day, more if I’m engaging in intense exercise.
4. A sleep tracker
This isn’t a supplement, but it might be the most important thing on this list after magnesium. Estrogen and progesterone help keep your airway muscles toned during sleep. When those levels drop, your airway becomes more collapsible. Snoring rates in women nearly double after menopause.
A sleep tracker can catch breathing disruptions, drops in oxygen, and changes in deep sleep — before you ever notice a symptom. If your data looks off, that’s your signal to get a sleep study.
>> I use an Oura Ring, which is the best one on the market, in my opinion.
5. A conversation with your doctor about HRT
Hormone replacement therapy isn’t right for everyone — especially if breast cancer runs in your family, like it does in ours. But the research is clear: when it is appropriate, HRT can be profoundly protective for your gums, your bones, your brain, and your sleep.
The key word is preventive. Once gum disease or bone loss has set in, HRT doesn’t reverse it. The earlier you have this conversation, the better.
If you’ve made it this far — thank you. I mean that. It’s a privilege to be able to write these newsletters, and I never take your time or attention for granted.
If there’s a topic you’d like me to go deeper on, or a question you’ve never been able to get a straight answer to — reply to this email. I read every one.
-Mark
STUDIES CITED & FURTHER READING
Antihistamines, Dry Mouth & Dental Damage:
Wolff A, Zuk-Paz L, Kaplan I. “Salivary gland output, composition and flow rate as related to the use of antihistamines.” International Dental Journal / Gerodontology. 2008;25(1):89-96. PMID: 18312369 Found that antihistamine users had significantly reduced submandibular and sublingual salivary flow — the glands most critical for keeping your mouth moist between meals.
Papas AS, Joshi A, MacDonald SL, et al. “Caries prevalence in xerostomic individuals.” Journal of the Canadian Dental Association. 1993;59(2):171-179. PMID: 8095845 The study that established the 2.89x and 3.27x cavity risk numbers — showing that dry mouth isn’t just uncomfortable, it’s a direct pathway to rampant decay.
Christensen CM, Navazesh M, Brightman VJ. “Effects of pharmacologic reductions in salivary flow on taste thresholds in man.” Archives of Oral Biology. 1984;29(1):17-23. PMID: 6581768 Demonstrated 30-75% salivary flow reductions across antihistamines and similar medications — confirming just how dramatically these drugs suppress your mouth’s primary defense system.
Quilici D, Zech J. “Medication-Induced Xerostomia and Its Implications for Dental Caries.” General Dentistry. 2019;67(6):48-52. PMID: 31355765 A clinical review that summarized the evidence and concluded medication-induced dry mouth “often results in rampant caries” — the paper that uses that alarming word.
Allergic Rhinitis, Mouth Breathing & Oral Health:
Vitale MC, Defabianis P, Rosti G, et al. “Allergic rhinitis as a risk factor for oral diseases in children: mouth breathing, dental caries and periodontal disease.” Journal of Clinical Pediatric Dentistry. 2023;47(6):74-82. PMID: 37997235 The 2023 study finding 40% of allergy patients were mouth breathers (vs 22% controls), with significantly more plaque and gum inflammation. Published just last year — this connection is finally getting the attention it deserves.
Bakhshaee M, Ashtiani SJ, Hossainzadeh M, et al. “Allergic rhinitis and dental caries in preschool children.” Dental Research Journal. 2017;14(6):376-381. PMID: 29238375 Found roughly 20% higher decay rates in allergy sufferers, with mouth breathers showing an additional 15% increase — confirming the double-whammy effect.
Green Tea (EGCG) & Histamine Inhibition:
Li GZ, Chai OH, Lee MS, et al. “Inhibition of phorbol ester-stimulated mast cell activation by epigallocatechin-3-gallate.” Experimental and Molecular Medicine. 2005;37(3):159-164. PMID: 16155406 The foundational paper showing EGCG directly inhibits mast cell degranulation and histamine release — the core mechanism behind green tea’s anti-allergy effect.
Yamashita K, Kumazawa T, Hatano Y, et al. “Epigallocatechin gallate inhibits histamine release from rat basophilic leukemia (RBL-2H3) cells.” Biochemical and Biophysical Research Communications. 2000;274(1):159-165. PMID: 10924324 Confirmed the mechanism: EGCG prevents histamine release by inhibiting a specific tyrosine phosphorylation pathway in immune cells.
Fujimura Y, Tachibana H, Maeda-Yamamoto M, et al. “Antiallergic tea catechin, (-)-epigallocatechin-3-O-(3-O-methyl)-gallate, suppresses FcεRI expression in human basophilic KU812 cells.” Journal of Agricultural and Food Chemistry. 2002;50(20):5714-5718. PMID: 12236706 Showed that tea catechins suppress the IgE receptor — the very first trigger in the allergic cascade — offering a mechanism for calming allergic response upstream of histamine release.
C15:0 (Pentadecanoic Acid / fatty15):
Imamura F, Fretts A, Marber M, et al. “Fatty acid biomarkers of dairy fat consumption and incidence of type 2 diabetes: A pooled analysis of prospective cohort studies.” PLoS Medicine. 2018;15(10):e1002670. PMID: 30303968 The independent landmark: 16 cohorts, 63,682 participants, finding that higher C15:0 levels were associated with approximately 20% lower risk of type 2 diabetes. This is the strongest independent evidence for C15:0’s metabolic benefits.
Wei M, Huang F, Zhao L, et al. “A dysbiotic gut microbiome in fatty liver disease is associated with altered short-chain and branched-chain amino acid and pentadecanoic acid pathways.” Nature Microbiology. 2023;8(8):1583-1596. PMID: 37386075 Published in one of the most prestigious microbiology journals — found that gut bacteria produce pentadecanoic acid from dietary fiber, and this pathway was protective against non-alcoholic liver disease.
Venn-Watson S, Lumpkin R, Dennis EA. “C15:0, an essential fatty acid, is broadly associated with improved health: A cell-based, preclinical, and human clinical study.” Scientific Reports. 2020;10:8161. PMID: 32424181 The foundational paper proposing C15:0 as an essential fatty acid — the first identified in 90 years. Note: lead author is affiliated with the fatty15 company.
Further reading on Ask the Dentist:
→ What I wish more people knew about green tea + your teeth — My deep dive into EGCG’s effects on the oral microbiome, cavity prevention, and how to drink green tea without damaging your enamel.
→ If Alzheimer’s runs in your family, read this — How the oral-brain connection works, why green tea crosses the blood-brain barrier, and the nightly routine I follow for neuroprotection.