The AI receptionist that answers the dentist's phone - every call, all day, in the voice of the practice.
A blue half-circle split like a molar cross-section: that is the whole company in one glyph. The receptionist you cannot see, sitting where the front desk used to be, picking up on the first ring at 2 a.m.
Here is a business fact that sounds made up but is not: dental practices in the United States spend roughly $7 billion a year paying people to answer the phone, and those phones still miss something like a third of the calls that come in. The calls are not spam. They are patients with toothaches trying to give the practice money. Eighty percent of dental appointments are booked over the phone, which means the phone is not a cost center that happens to sit near the revenue - the phone is the revenue, and a large slice of it is going to voicemail.
Arini is a San Francisco company that decided this was, in a literal sense, an arbitrage. If a dropped call is worth about $5,000 in downstream patient value, and you can build software that never drops a call, then you are not selling a chatbot. You are selling recovered money, which is a much easier thing to sell.
The product is an AI receptionist. It answers inbound calls 24/7, schedules and reschedules appointments, fields the tedious insurance and billing questions, and writes everything straight into the practice management software the office already uses - OpenDental, Denticon, EagleSoft, Weave. It speaks English and Spanish. It responds in under 90 milliseconds, which is fast enough that patients mostly do not clock that they are talking to a computer. And crucially it does not call in sick, quit, or need to be retrained every quarter, which in an industry with chronic front-desk turnover is a large part of the pitch.
What makes Arini interesting is not that it is an AI voice agent - there are many of those now - but where it pointed the technology. The founders did not start with a model and go looking for a market. They started with the dentist's front desk, which is about as unglamorous a place as AI has been asked to work, and which turns out to be exactly why it works.
Numbers customers have publicly attributed to Arini. Figures are self-reported by the practices and should be read as illustrative, not audited.
Sources: Unified Dental Care (+12% revenue), Normandy Lake Dentistry (90% answer rate), Kare Mobile (-80% missed calls, ~2 hrs/day saved).
A voice agent that picks up 24/7, books and reschedules appointments, and answers insurance and billing questions - in English and Spanish.
Coordinated calls and texts: reminders, follow-ups and booking flows that meet patients on whichever channel they use.
Block scheduling, staggered appointments and practice-specific logic that write directly into the calendar.
One-click hookups to OpenDental, EagleSoft, Denticon, Weave and phone systems like GoTo and Jive.
Sends calls to the right department and pings staff the moment a booking lands.
Dashboards on bookings, answer rates and performance across single offices and multi-location groups.
Abdulrahman Jamjoom and Rami Rustom met in high school in Jordan and had already built one startup together before Arini. Both were early engineers on Meta's Threads team, where they worked on search and led AI initiatives. They picked dentistry the unfashionable way - by literally visiting practices, shadowing dentists, and watching the front desk buckle under six hours of phone calls a day.
Studied computer science at Harvard; early engineer at Threads where he led search. Runs point on Arini's product and go-to-market with dental groups and DSOs.
Studied computer science at MIT; engineer at Threads on the AI team. Leads the voice and infrastructure stack behind Arini's sub-90ms, HIPAA-compliant calls.
Investors: Y Combinator, Sanabil Investments, J17 Ventures, SBXi, and Transpose Platform Management.
The plan for the capital, per the company: expand the engineering and forward-deployed teams, deepen product, and get the AI Receptionist into more practices and DSOs. This is a lean company - roughly 16 people - running a field-engineering model where staff embed with customers to tune each practice's call flow.
Healthcare voice AI has an unforgiving spec sheet: it has to be fast enough to feel human, natural enough not to spook a nervous patient, multilingual, and HIPAA-compliant with sensitive data - all on the same call. Arini's answer on the voice layer is a partnership with Cartesia, whose Sonic text-to-speech runs at roughly 90ms to first byte, about twice as fast as Arini's previous provider.
That latency number is not a vanity metric. On a phone call, a half-second pause reads as "something is wrong," and patients hang up. Recovering a $5,000 booking sometimes comes down to whether the AI answers a question a beat faster than a human would have. It is a strange place for a state-space speech model to earn its keep, which is exactly the kind of detail that makes Arini fun to write about.
Raises a reported ~$500K round backed by Y Combinator, Sanabil, J17 Ventures, SBXi and Transpose Platform Management.
Launches publicly through Y Combinator (W24) as "The AI receptionist for dentists."
Latest reported funding activity; total funding to roughly $630K.
Scales the AI Receptionist to over 15,000 patient calls handled per day across US and Canadian practices.
Sources: arini.ai · Y Combinator · YC Launch · Crunchbase · PitchBook · Cartesia case study · Deepgram AI Minds · Tracxn. Funding figures and customer-reported metrics are approximate and drawn from public sources.
Arini is a San Francisco-based AI company that builds a voice and text receptionist for dental practices. Its AI agent answers patient calls 24/7, books and reschedules appointments directly into practice management software, and handles insurance and billing questions - aiming to recover the revenue clinics lose when front desks miss roughly a third of inbound calls. Founded in 2024 by Abdulrahman Jamjoom and Rami Rustom, both former engineers on Meta's Threads team, the company went through Y Combinator's Winter 2024 batch and now handles over 15,000 patient calls a day for dental groups and DSOs across the US and Canada.
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