Ordinary toothpaste is not HSA eligible. The IRS treats it as a personal hygiene expense, the same category as shampoo or soap, so paying for it with pretax HSA dollars is not a qualified medical expense. The narrow exception is a medicated toothpaste your dentist or doctor prescribes to treat a diagnosed condition, backed by a Letter of Medical Necessity.
Why Regular Toothpaste Is Excluded
HSA funds can only pay for “qualified medical expenses,” a term the tax code ties to diagnosing, treating, or preventing disease, or to something that affects a structure or function of the body.1Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses The IRS separates products that treat a specific problem from products used for everyday hygiene, and toothpaste sits on the hygiene side.
Publication 502 names it outright: “the cost of a toothbrush and toothpaste is a nondeductible personal expense.” The same publication explains that an item ordinarily used for personal or family purposes only counts when it is used primarily to prevent or alleviate a physical or mental disability or illness.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses
Whitening toothpaste is a firmer no. The tax code excludes cosmetic products and procedures, meaning anything aimed at improving appearance without meaningfully treating illness or supporting body function, from the definition of medical care.1Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses
The CARES Act Did Not Change This
Since 2020, the CARES Act has allowed HSA, FSA, and HRA funds to buy over-the-counter medicines and drugs without a prescription.3Internal Revenue Service. IRS Outlines Changes to Health Care Spending Available Under CARES Act That expansion covers medicines and drugs, not personal-care items. The Inventory Information Approval System, which retailers use to flag eligible items at checkout, groups toothpaste and other oral care products under “Other Ineligible Products” rather than eligible OTC medicines.4SIGIS.org. Eligible Product List Criteria
When Medicated Toothpaste Qualifies
A toothpaste can become HSA eligible when a healthcare provider determines it is medically necessary for a specific diagnosed condition. The controlling standard is the “primarily” test from Publication 502: a personal-use item qualifies only when it is used primarily to prevent or alleviate a disability or illness.2Internal Revenue Service. Publication 502 (2025), Medical and Dental Expenses Examples that can meet the bar:
- A high-fluoride prescription paste to combat rampant tooth decay or halt enamel erosion beyond what regular brushing addresses.
- A toothpaste with antiseptic or antimicrobial ingredients prescribed for active gingivitis or advanced periodontal disease.
- A desensitizing formula prescribed to manage severe dental hypersensitivity tied to a specific clinical condition, not occasional sensitivity.
The product has to target a clinical condition. A standard fluoride toothpaste pulled off the shelf without a diagnosis does not qualify, even if a dentist has generally suggested you brush with fluoride.
Getting a Letter of Medical Necessity
To spend HSA money on medicated toothpaste, get a Letter of Medical Necessity from a licensed dentist or physician. The letter should include:
- Your specific diagnosis, such as xerostomia, chronic periodontal disease, or radiation-induced caries.
- The name or type of toothpaste being recommended.
- A brief explanation of why this product is medically necessary rather than a general hygiene choice.
- The provider’s signature and date.
These letters are typically valid for 12 months or until the end of your benefit plan year, whichever comes first. Ask for a new one each year you continue treatment, or sooner if your treatment plan changes. A dental consultation to obtain the letter usually runs between $40 and $300, though your dental insurance may cover the visit.
How to Actually Pay for It
Do not expect your HSA debit card to clear at the register. The point-of-sale verification system classifies all oral care products as ineligible regardless of any prescription behind them.4SIGIS.org. Eligible Product List Criteria Plan to pay out of pocket and submit a reimbursement claim to your HSA administrator with a copy of the receipt and your Letter of Medical Necessity attached. Some administrators take uploads through an online portal; others still use paper forms.
Records to Keep
The IRS does not check HSA purchases at the time of sale. Documentation is on you if the return is ever audited. For each medicated toothpaste purchase, hold onto the itemized receipt, the current Letter of Medical Necessity covering the purchase date, and any Explanation of Benefits if dental insurance was involved. Keep everything for at least three years after the tax filing deadline for the year of the purchase.5Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans Without documentation, the IRS can reclassify the distribution as non-qualified and charge tax plus a penalty.
Penalties for Using HSA Funds on Ineligible Toothpaste
If you use HSA money on toothpaste that does not qualify, the amount is added to your taxable income for the year, and you owe an additional 20 percent tax on top of regular income tax.6Office of the Law Revision Counsel. 26 U.S. Code 223 – Health Savings Accounts A $50 ineligible purchase means income tax on the $50 plus a $10 penalty.
If the purchase was an honest mistake, you can return the money to your HSA and avoid both the tax and the penalty. The IRS allows repayment of a mistaken distribution when the error was a reasonable one, provided you put the funds back by the due date of your tax return (not counting extensions) for the year you discovered the error.7Internal Revenue Service. Instructions for Forms 1099-SA and 5498-SA Contact your HSA administrator to arrange the repayment, since they will need to correct their reporting to the IRS.