Project ideas from Hacker News discussions.

Dyson CameraJet electric toothbrush

Original Article

Hacker News Discussion

📝 Discussion Summary (Click to expand)

Three prevalent themes in the discussion

Theme	What the commenters said	Representative quotes
1. Price/value skepticism – Many feel $500 is excessive for a toothbrush, especially when cheaper alternatives exist.	• “500 bucks for a toothbrush, but could be some interesting angles.” – Oscalemor • “Unfortunately $500 isn’t much on the scale of dental care if it actually works.” – Normal_gaussian • “$500 + $15/replacement head… Right now they are out of stock… it’s been a mistake.” – al_borland • “Definitely not 500$ worth of awesome though.” – SpyCoder77
2. Effectiveness / personal experience with water flossers and oral‑care tools – Opinions split on whether water‑jet devices help gums, cause damage, or are unnecessary.	• “If this is doing better waterpik + toothbrush … I could see the appeal.” – wkoszek • “An ultrasonic scaler is far better at removing plaque … than a waterpik.” – darksim905 • “My oral irrigator is super important for my gums… I constantly had problems with my gums.” – vjvjvjvjghv • “The water jet ruined my teeth. I would not advise anyone to use them.” – vinni2
3. Technology/gimmick perception – The AI, camera, and “over‑engineered” branding are viewed as either innovative or a marketing ploy.	• “I wonder what stack they're using to stream live video from the toothbrush to the phone…” – iAMkenough • “Presumably AI is going to process the images and detect issues…” – agnosticmantis • “This is the gold standard of how to properly apply AI to an existing product like a toothbrush…” – rvz • “AI toothbrush was not on my 2026 bingo card.” – shhsshs

🚀 Project Ideas

BrushCam Coach

Summary

A smartphone app that uses the phone's front camera and AI to give real‑time brushing feedback, turning any toothbrush into a smart guide without expensive hardware.
Core value proposition: Affordable AI coaching for better plaque removal and gum health, eliminating the need for $500 camera toothbrushes.

Details

Key	Value
Target Audience	Budget‑conscious consumers, families, anyone wanting to improve brushing technique without buying premium gadgets
Core Feature	Real‑time video analysis of brushing motion, coverage, pressure estimation, and timing via phone camera; provides audio/visual cues
Tech Stack	React Native (or Flutter), TensorFlow Lite/OpenCV for pose estimation, optional Bluetooth for pressure sensor
Difficulty	Medium
Monetization	Revenue-ready: Subscription (free basic timer, premium $4.99/mo for advanced analytics and personalized plans)

Notes

HN user timmg said they'd happily spend $500 if it really works; many commenters want AI feedback without the high price (SamBam notes meta‑analyses show little difference between manual and powered brushes).
Provides a low‑barrier way to experiment with AI‑guided brushing, sparking discussion on efficacy versus manual brushes while delivering practical utility for everyday users.

PureFlow

Summary

A shower‑line connected water flosser with built‑in UV‑C self‑cleaning nozzle and antimicrobial tubing to prevent biofilm buildup, eliminating reservoir maintenance and size issues.
Core value proposition: Delivers the gum‑health benefits of water flossing with zero‑maintenance, compact design ideal for small bathrooms.

Details

Key	Value
Target Audience	Users who like water flossers but hate reservoir cleaning, biofilm, and bulky units (e.g., wkoszek, Topfi, vjvjvjvjghv)
Core Feature	Direct‑tap water connection, UV‑C LED sterilization of nozzle after each use, anti‑biofilm silicone tubing, optional pressure regulator
Tech Stack	Medical‑grade silicone, UV‑C LED, ESP32 microcontroller (C/C++ firmware); optional companion app in Flutter for usage stats
Difficulty	High
Monetization	Revenue-ready: Hardware sale $79 + replacement nozzle subscription $9/quarter

Notes

wkoszek complained: “I dropped $60 on Waterpic and it broke… got a better Waterpik for $100+ but it was clunky… And it broke.” Topfi also worries about tank size. fnord77 already uses a shower‑line flosser, showing demand.
Addresses maintenance friction and size concerns, likely to generate discussion on UV‑C safety and efficacy while offering a practical solution for regular flossing.

PlaqueScan

Summary

A smartphone app paired with a cheap intraoral mirror attachment that uses AI to analyze photos of teeth and gums, quantifying plaque coverage and detecting early signs of gingivitis.
Core value proposition: Gives users objective, actionable insights into oral health between dentist visits, reducing guesswork and expensive over‑treatment.

Details

Key	Value
Target Audience	Health‑conscious individuals, orthodontic patients, anyone wanting to track oral hygiene objectively (e.g., users frustrated by inconsistent dentist advice, senectus1)
Core Feature	Guided photo capture (lighting, angle), AI model scores plaque index and gum inflammation, tracks trends, offers personalized tips
Tech Stack	Swift/Kotlin app, TensorFlow Lite model trained on dental images, optional 5 mm intraoral mirror with LED ring (hardware kit)
Difficulty	Medium
Monetization	Revenue-ready: One‑time purchase of mirror kit $19 + free app; optional premium analytics $2.99/mo

Notes

senectus1 lamented: “I find the inconsistent advice from 'Dentists' very discouraging.” agnosticmantis noted: “Presumably AI is going to process the images and detect issues and suspicious changes.”
Provides data‑driven feedback that empowers patients, likely to spark discussion on patient‑self‑monitoring versus professional visits while offering a practical, low‑cost tool for ongoing oral health tracking.