Here’s something that doesn’t get talked about enough: most people are brushing their teeth too hard. And the toothbrush that feels like it’s doing the most work — the firm, scratchy one that leaves your gums feeling “properly cleaned” — is often the one causing the most damage.

Bristle hardness is one of the most practically important things to get right when choosing a toothbrush, bamboo or otherwise. Here’s what actually matters.

What soft, medium, and hard actually mean

The terms refer to the stiffness of the individual bristle filaments — specifically how much force is required to bend them. There’s no single universal standard, so “soft” from one manufacturer isn’t identical to “soft” from another, but the general categories hold:

  • Soft — bristles flex easily with light pressure. They follow the contours of teeth and gums without resistance. This is what the vast majority of dental professionals recommend.
  • Medium — stiffer, requires more force to bend. More abrasive on enamel and gums. Still widely sold, though dental guidance has moved away from recommending them for most people.
  • Hard (or firm) — stiff bristles that require significant pressure to flex. Can cause real damage with regular use. Largely fallen out of favor in mainstream dental recommendation.
  • Extra soft — softer than standard soft. Specifically designed for people with gum sensitivity, gum disease, post-surgery recovery, or very young children.

What dentists recommend — and the reason behind it

The American Dental Association recommends soft-bristle toothbrushes for most adults. This isn’t hedged or conditional — it’s a clear position backed by research on gum recession and enamel wear.

The logic is straightforward: your teeth don’t need to be scrubbed. Toothpaste contains abrasive particles that do the actual mechanical cleaning work; the bristles just help distribute it and sweep debris away. You don’t need stiff bristles to clean teeth effectively — you need adequate contact time and technique.

What stiff bristles do is add unnecessary abrasion. Every time you brush, you’re making microscopic contact with enamel and gum tissue. Do that twice a day for years with medium or hard bristles and the cumulative effect becomes visible: receding gums, notched enamel at the gumline, increased sensitivity.

The real problem with hard bristles (it’s not what most people expect)

Most people who prefer firm bristles say it feels cleaner. This is real — firmer bristles do provide more tactile feedback. The problem is that “feeling cleaner” and “being cleaner” are not the same thing.

Here’s what research consistently shows with hard-bristle or overly firm brushing:

  • Gum recession — the gum tissue at the base of teeth wears away over time. This is largely irreversible without surgical intervention and exposes the sensitive root surfaces of teeth.
  • Cervical abrasion — notching or wear at the point where the tooth meets the gum. This isn’t decay; it’s physical erosion from the brush. Once the enamel is worn in this area, it doesn’t grow back.
  • Dentinal hypersensitivity — as enamel and gum tissue recede, the dentine underneath becomes exposed. This is the main cause of the “sensitive teeth” sensation when eating cold or sweet foods.

The frustrating part is that this damage accumulates slowly over years. Most people don’t connect their increased sensitivity or visible gum recession to the toothbrush they used in their thirties. By the time it becomes obvious, it’s been happening for a long time.

Is there ever a case for medium bristles?

Honestly? For most people, no. The scenarios where medium bristles might be appropriate are narrow:

  • People with dentures or orthodontic appliances who need slightly more mechanical action to clean around hardware — and even then, this is usually managed by brush design rather than bristle stiffness
  • People who have been specifically advised by their dentist based on their individual situation

Outside of these specific cases, the evidence doesn’t support medium bristles over soft for regular oral hygiene. The “it feels cleaner” intuition is worth examining — it’s often a signal that someone has been brushing too hard for a long time and soft bristles initially feel insufficient by comparison. That usually adjusts within a week or two.

Soft bristles and sensitive teeth: what to know

If you have sensitive gums, gum disease, have recently had a dental procedure, or are recovering from a period of gum inflammation, extra-soft bristles are worth considering. The reduced abrasion gives irritated tissue a chance to recover without making brushing painful — which is important, because the alternative is people avoiding thorough brushing and making the underlying condition worse.

For children, the same principle applies with extra emphasis: kids’ gums are more delicate, and the habits formed early (including brushing pressure) tend to persist. Extra-soft or soft bristles appropriate to the age of the child, with a small brush head, are the standard recommendation from paediatric dental professionals.

Our bamboo toothbrush range includes both adult and children’s sizes, with soft bristles as standard across both.

What ibannboo uses — and the specific reason we chose it

All of our bamboo toothbrushes come with soft Nylon 1010 bristles as standard. We don’t offer medium or hard bristle options, and this is a deliberate choice rather than an oversight.

We’re a factory, so we’ve thought about this more than most. Here’s the reasoning:

Soft bristles clean just as effectively as stiffer ones when used correctly. There is no dental benefit to offering medium or hard bristles — only a higher risk of the long-term damage described above. We’d rather make a product that’s unambiguously good for your dental health than offer a range that includes options we’d have to caveat heavily.

The bristles we use — DuPont Tynex® RS Nylon 1010 — are plant-based (derived from castor oil rather than petroleum), FDA compliant, and manufactured to consistent softness standards. If you want to understand exactly what’s in the bristles, our bristle materials guide goes into full detail.

If you’re looking for an extra-soft option for post-surgical recovery or gum sensitivity, get in touch — we can discuss what’s available.

Frequently Asked Questions

I’ve always used medium bristles and my teeth feel fine. Should I switch?
If your gums haven’t receded and your dentist hasn’t flagged any enamel wear, you may have naturally light brushing pressure — which matters more than bristle hardness. But “feels fine” and “no damage is occurring” aren’t always the same thing. If you ask your dentist specifically to check for cervical abrasion at your next visit, they’ll give you a clear answer about whether your current approach is working for your teeth specifically.
Are bamboo toothbrush bristles naturally softer than plastic ones?
No — the softness is determined by the bristle material and diameter, not the handle. A soft bamboo toothbrush and a soft plastic toothbrush with the same bristle specification will feel identical. The bamboo handle has no effect on bristle flex. The key is to check the bristle hardness rating when choosing either type.
What bristle hardness is best for someone with braces?
Soft is still the recommendation, even with braces. The brackets and wires require a bit more thoroughness and time, not more force. Most orthodontists recommend soft-bristle brushes plus an interdental brush or water flosser for getting around the hardware. Hard bristles don’t help with braces and carry the same enamel-wear risks.
My bamboo toothbrush bristles feel too soft. Am I cleaning my teeth properly?
Almost certainly yes — if you’re brushing for two full minutes with good technique (small circular motions, covering all surfaces). The feeling of “not clean enough” with soft bristles often comes from the contrast with what harder bristles feel like. Give it a few days. If your teeth feel clean, your breath is fresh, and your gums aren’t bleeding, the soft bristles are doing their job.