Item : B0013TVEYS Customer Reviews Good, but by .. M. Kulessa () Well, they should be identical to what comes with the original toothbrush but somehow I have a feeling that they fit not as snug as the original two that came with the unit. That leads to a slight rattling/humming. Most people probably wouldn't notice anything though - and perhaps it's just my imagination... anyways, they clean the same and last the same. Small Mouth Needs Great Compact Brush by .. Jackie BF (Kailua, HI) Although I am an adult, I have a very small mouth. The regular brush heads are too large and do not do as good a job as the compact one does. Sonicare and the ProResults Compact Brush Heads complete the work of my dentist. great refill pack by .. suz () This is a great refill pack for the Sonicare toothbrush and much cheaper then buying it in a store. The seller was great, very fast in getting it shipped. Great replacement heads for Sonicare FlexCare by .. David Nedde () I got these to replace the head on my "Philips Sonicare FlexCare Rechargeable Sonic Toothbrush". They fit perfectly. The bristles seem like they might be a little different shape than the original brush, but it works just fine. Best price I've found...I love this toothbrush! by .. Teresa J. Haller (Ohio) I recommend that everyone get this toothbrush, then when you need replacement heads, buy from Amazon. I searched at COSTCO Warehouse Club and did an online price comparison. You can't beat the deal Amazon gives you when you sign up for the automatic shipment that delivers new brush heads every three months. I saved money, got free shipping and I don't have to waste my time and gas running around purchasing the replacement heads. Thank you AMAZON!!!!