No, you cannot buy regular toothpaste with an FSA. The IRS treats toothpaste as a personal toiletry rather than medical care, so your plan administrator will reject the charge. The one exception is prescription or medicated toothpaste ordered by a dentist to treat a diagnosed condition, which qualifies with a Letter of Medical Necessity.
Why the IRS Says No
Federal tax law defines a medical expense as something used to diagnose, treat, or prevent disease, or to affect the structure or function of the body.1Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses The Treasury regulation implementing that definition names toothpaste specifically as a toiletry that falls outside medical care, alongside shaving cream, deodorant, and face lotion.2eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
IRS Publication 502, the agency’s main guide to deductible medical expenses, says it plainly: “the cost of a toothbrush and toothpaste is a nondeductible personal expense.”3Internal Revenue Service. Publication 502, Medical and Dental Expenses FSA reimbursements use the same definition of medical care that governs the deduction, so anything the IRS treats as personal is also blocked from your FSA.
Does Fluoride Toothpaste Count as an OTC Drug?
The CARES Act of 2020 made over-the-counter medicines FSA-eligible without a prescription. Because the FDA classifies fluoride toothpaste as an over-the-counter anticaries drug product,4U.S. Food and Drug Administration. OTC Monograph M021 – Anticaries Drug Products for Over-the-Counter Human Use some people assume fluoride toothpaste now qualifies.
It doesn’t. The IRS has not updated its position, and Publication 502 as of 2025 still lists toothpaste as a nondeductible personal expense.3Internal Revenue Service. Publication 502, Medical and Dental Expenses The regulation naming it a toiletry remains in effect. Until that changes, fluoride toothpaste bought for everyday use stays ineligible.
When Prescribed Toothpaste Qualifies
Toothpaste becomes a medical expense when a licensed dental professional prescribes it to treat a diagnosed condition. Typical examples include high-fluoride prescription toothpaste for advanced periodontal disease, radiation-related dry mouth, or severe enamel erosion beyond normal wear. At that point the product is part of a treatment plan rather than routine hygiene.
To get reimbursed, you need a Letter of Medical Necessity from your dentist or physician. The letter should identify your diagnosis, name the specific product, and explain why it is medically required.5FSAFEDS. Eligible Health Care FSA Expenses Get the letter before you buy. Administrators routinely deny claims submitted without documentation, and going back to obtain the letter after the fact can delay or block reimbursement.
Other Dental Products at the Drugstore
The same rule that excludes regular toothpaste runs across the oral care aisle: everyday hygiene items are out, condition-specific products are in.
Not Eligible for Everyday Use
- Manual and electric toothbrushes are personal care items, even if your dentist recommends one.3Internal Revenue Service. Publication 502, Medical and Dental Expenses
- Dental floss is treated as preventive hygiene, not medical treatment.
- Standard mouthwash used for fresh breath or general hygiene is a toiletry.2eCFR. 26 CFR 1.213-1 – Medical, Dental, Etc., Expenses
- Teeth whitening products are classified as cosmetic and explicitly excluded.3Internal Revenue Service. Publication 502, Medical and Dental Expenses
- Water flossers are ineligible for routine use but can qualify with a Letter of Medical Necessity.6FSAFEDS. Eligible Limited Expense Health Care FSA Expenses
Generally Eligible
- Denture adhesives and cleaners qualify without extra documentation, since they serve a specific dental condition.
- Orthodontia wax is eligible because it supports orthodontic treatment, which itself counts as medical care.
- Medicated or prescription mouthwash for oral infections, severe dry mouth, or post-surgical care qualifies with a Letter of Medical Necessity.5FSAFEDS. Eligible Health Care FSA Expenses
- In-office fluoride treatments are eligible as preventive dental care. Over-the-counter fluoride rinses need a prescription and a medical diagnosis to qualify.
- Dental procedures — cleanings, fillings, extractions, X-rays, and orthodontic treatment — all count as medical expenses.3Internal Revenue Service. Publication 502, Medical and Dental Expenses
Paying and Keeping Records
Every FSA reimbursement needs proof. At minimum, keep an itemized receipt showing the merchant, date, and description of the product or service. A credit card statement is not enough on its own because it does not identify what you bought.7Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans For anything eligible only with medical justification, add the signed Letter of Medical Necessity stating your diagnosis, the recommended product, and how long you are expected to need it.5FSAFEDS. Eligible Health Care FSA Expenses
If your FSA debit card is declined at checkout for a product the register cannot verify, or if your plan does not issue a card, pay out of pocket and submit a claim through your administrator’s portal with the receipt and any documentation attached. Most approved claims are paid within a few business days.7Internal Revenue Service. Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans
If you accidentally run regular toothpaste or another ineligible item through your FSA card and the charge goes through, your administrator will flag it during review and ask you to repay the amount or provide documentation showing medical necessity. Unpaid amounts can be added to your taxable income for the year, and repeated misuse can lead to card suspension. Checking your plan’s eligible expense list before you swipe is the simplest safeguard.