I've only just got around to reading this article and HN discussion, hence the belated reply. I thought I would test out your use-case, and it gave me 4 legit products (I verified them), and also 3 additional tips. One reason I think our results could differ is because I don't just "bark orders at it" but instead "talk to it" and give it context. I think the contextgives it chance to "understand the topic" and then "answer the question" in 2 steps, whereas when you just say "toothpaste without SLS", it's just filtering a list without understanding why you or it would want to filter it that way. Also I think being polite helps, and I've seen posts here on HN that agree. So here's my prompt, FYI;

> Today I had a dentist appointment and mentioned having sensitivity issues, to which the dentist suggested I try a different toothpaste. I would like you to suggest some options that contain fluoride. However, I am also predisposed to canker sores if I use toothpaste with SLS in it, so please do not suggest products with SLS in them.