Resetting the timer in my toothbrush
Hackers have reverse‑engineered the NFC-based “brush head timer” in Philips Sonicare toothbrushes, allowing users to reset the built‑in counter that nags them to replace heads after a set number of minutes. Commenters debate whether this kind of tracking is a useful hygiene aid or a form of DRM-style lock‑in that drives unnecessary replacements, with related concerns about cost, e‑waste, and consumer autonomy. The thread broadens into comparisons with other “smart” appliances, differing dental hygiene routines, and even low-tech alternatives like miswak sticks.
NFC timer hack & technical details
- Earlier work required sniffing the NFC password; the new article uses a public form to generate it.
- Some commenters reference a video showing the password derivation, with minor complaints about shaky handheld filming instead of screen capture.
- There is debate over whether firmware reverse engineering was involved; one claim says yes, another says traffic was just plaintext.
- NFC tags in brush heads lock write access after three wrong passwords; one user “bricked” a head this way, but the brushing function still worked.
- Practical tips: the password tool expects a space inside the serial (e.g.,
230419 11K), and some iPhone users needed to split the final advanced NFC command into two writes to avoid “TAG CONNECTION LOST.”
Is the toothbrush “consumer-hostile”?
- Some see the NFC-based replacement reminder as mild and user-friendly: a beep or two, an amber LED, and no functional lockout.
- Others describe frequent, loud reminder beeps as highly annoying, and object that the only “supported” fix is buying a new head.
- Manuals for some models reportedly allow disabling the reminder; it’s unclear if this applies universally.
- Many agree the worst part is expensive proprietary heads, not the reminder itself.
Replacement intervals & dental health
- Built-in counter targets ~360 minutes of use (about 90 days at 2×2 minutes/day), matching common 3–4 month guidance.
- Some appreciate the nudge, noting clear performance differences with new heads.
- Others prefer deciding based on visible wear/feel, and dislike “forced” schedules.
- Long subthreads debate brushing time (2 minutes vs 4–6+ minutes), interdental brushes, floss, irrigators, toothpaste abrasiveness, and mouthwash use, with conflicting claims and heavy reliance on personal experience.
DRM, safety, and liability analogies
- The toothbrush is compared to DRM-locked appliances (notably GE fridges that refuse water/ice with “expired” filters).
- One side emphasizes safety and liability (e.g., bacterial growth in old filters).
- The opposing view stresses owner autonomy and criticizes devices that disobey users to drive consumable sales.
Alternatives & preferences
- Some prefer simpler or non-electric options (manual brushes, bamboo, or miswak twigs) to avoid e‑waste and lock-in; others worry miswak can miss surfaces.
- Users compare Sonicare and Oral-B comfort and bugs, with mixed personal preferences but broad agreement that modern electrics can improve cleaning.