Hello, John! Thanks for reaching out through your review. I'm glad to hear you like your SmartClean! Our brush heads are indeed unique to our toothbrush, and I'm afraid there are no other brands that will be compatible. We do have full availability for all of our brush heads on OllieSmile.com, and we offer a subscription option that saves you 15%. The subscription can be modified in any way at any time, or cancelled at any point. Please don't hesitate to reach out to us at Support@olliesmile.com if we can help with anything, or if you have any questions.