The Humble Co Bamboo Interdental Brush Size
Lower concern. Bamboo and nylon interdental brush with no known PFAS risk.
Humble Co's bamboo interdental brush uses natural bamboo and standard nylon bristles. No coating or water-repellent treatment typical of PFAS risk; brand makes no PFAS claims.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Bamboo handle, nylon bristles
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What The Humble Co Bamboo Interdental Brush is made of, ingredients and materials
The Humble Co interdental brush combines a bamboo handle with nylon bristles. Bamboo is a natural cellulose material that does not leach or off-gas hazardous chemicals in normal use; it is biodegradable and poses no documented toxicity concern as a handle material. Nylon bristles are a synthetic polymer that does not release monomers or plasticizers during dry, room-temperature oral use.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Bamboo handle splinter or degradation risk
Bamboo is softer than plastic and can splinter if dropped or over-flexed, particularly at the bristle junction. Prolonged moisture exposure may cause the handle to soften, swell, or develop surface deterioration. This does not pose a chemical hazard but may reduce product durability or cause minor mouth contact with loose fibers.
Bacterial growth or biofilm on moist handle
Bamboo is a porous natural material that absorbs water and can harbor bacteria or fungal growth if not dried thoroughly between uses. Unlike molded plastic or sealed silicone, bamboo does not inhibit microbial colonization. Proper air-drying and replacement on a regular schedule mitigate this risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
Nylon bristles in toothbrushes and interdental brushes do not typically contain formaldehyde-releasing resins; formaldehyde is used in some synthetic textile dyes and finishes, but nylon bristle production does not require this. No published reports link nylon interdental brush bristles to formaldehyde release.
Source, ATSDR ↗Heavy metals
The product description does not specify bristle color treatment or pigmentation. If bristles are undyed or naturally white nylon, no azo dye or heavy metal pigment concern arises. If dyed, the specific dye class is not documented; however, oral toothbrush and interdental brush bristles are subject to consumer product safety standards in most markets that limit azo dyes and heavy metal content.
Source, FDA ↗Nylon bristle microfiber shedding
Nylon bristles can shed microscopic fibers with heavy brushing or when worn. Interdental brushes are not heated or chewed like toothbrushes, reducing mechanical fiber release, and any fibers shed are nylon polymers that pass through the digestive system without absorption. No documented oral health risk from nylon fiber shedding in interdental brush use is on record.
The full breakdown
The brand's record and disclosure
Humble Brush is a Swedish oral care brand that emphasizes sustainability and natural materials; the company does not appear to have published detailed ingredient or material safety certifications for this specific product. No recalls, safety complaints, or contamination incidents are on record for this interdental brush. The brand's stance on PFAS is not publicly stated, but the product materials (bamboo and nylon) do not require PFAS-based water or stain resistance.
How it compares in its category
Interdental brushes are a functional oral care device, not cosmetics in the traditional sense; they are classified as consumer products or medical devices depending on jurisdiction. This bamboo and nylon design avoids metal wire (which can corrode or leave deposits) and silicone bristles (which can harbor bacteria if not replaced regularly). Compared to plastic-handled alternatives, the bamboo handle reduces petroleum-based waste, though durability in moisture may be lower than molded plastic.
If you buy it
Store the brush in a dry location after each use; bamboo absorbs moisture and can warp or develop mold if left wet or in a sealed container. Replace the brush every 2-3 months or sooner if bristles fray, bend, or show signs of wear; worn bristles reduce cleaning efficacy and may cause gum irritation. Do not expose to heat (dishwasher, boiling) as this can damage bamboo. If the handle develops soft spots, discoloration, or smell, discard and replace.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Humble Brush has made none
Formulations change between production runs, so check the current label. How we grade.
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How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.