r/ideavalidation

I had a dumb business idea so I'm going for it. I feel like love letters, family holiday letters and honestly just writing letters to each other is dying out. I write, so I'm pretty passionate about keeping mail alive haha. I think that more people need to receive and send letters, period. I think there are so many people who grew up on text messages and facetime that they've literally MAYBE never even received a letter. Which makes me sad. I think the world would be a better place if more of us mailed letters to our friends. So I figured I'd attempt to save it, sorta. www.SendADamnLetter.com

The idea is you type the exact message and I physically write it by hand, put it in an envelope, stamp it, and mail it or I help you figure out what to say first or go with the flow. I write screenplays and journal daily so my handwriting is pretty awesome.

Just me sitting in my office writing per usual. I love getting letters in the mail and sending them to friends and family. I feel like it's dying out and I don't want to let that happen. There's no way I'm the only one that thinks about this? Lol

Either way, I'll never let writing letters fade away.

If you feel giving any feedback or talking about it. I have the link but unsure if we're allowed to do that here.

Roast the idea and website if you want. I genuinely want to know whether this is stupid enough to work. Would love your feedback especially because analog hits close to home for me.

Most of us brush twice a day, but how often do we know whether we're brushing effectively?

I'm building KIRI, an AI-assisted smart toothbrush designed to close that feedback gap.

Here's how it works:

Sense: Motion and pressure sensors track how you brush.
Correct: Real-time audio guidance and adaptive motor control help respond to brushing behaviour.
Learn: Repeated sessions help KIRI learn your brushing patterns and personalise guidance over time.
See: We're developing a detachable intraoral camera module with controlled illumination to capture structured images of your mouth.
Personalize: Our longer-term goal is to combine camera-based oral mapping with brushing data, connecting how you brush to your own oral anatomy and adapting guidance accordingly.

We're also developing an attachable intraoral camera to explore how brushing behaviour could eventually be mapped to an individual's own oral anatomy.

The goal is simple: a toothbrush that adapts to how you brush, rather than forcing you to learn a completely new routine.

We're targeting a launch price of around $149, and I'd love honest feedback:

Would you use a toothbrush that learns and adapts to your brushing habits?
What would it need to do to justify $149?
What would make you skeptical about a product like this?

I'm the founder, so I'm biased. I'd rather hear the objections now than discover them after launch.

If you'd like to follow the build or get early access: https://careease.in/

#Smarttoothbrush #oralhealth

r/ideavalidation

Send a Damn Letter. I built a service where I handwrite and mail letters for people. No AI. I love writing and it's a fun hobby for me. Mailing people letters is better for the world.

I'm building a toothbrush that learns how you brush and adapts to you