We're sad to hear this, Angelica. With the many quality tests these brushes go through, this isn't the result we expect. So we can learn more, we ask that you please give us a call at (800) 566-7252.

We're so sorry to hear about this, Heidi. All our battery and electric toothbrushes go through extensive quality control testing to ensure they work perfectly. Since this wasn't the case for you with the Oral-B Pro Advantage, please call us at (800) 566-7252 and we'll be glad to help.

We know how important it is to easily replace your brush head, and are happy to help. To change the brush head, place the QuickRelease tool (included in the brush head package) on the neck of the toothbrush and press, then slide the brush head off. Lay the new replacement brush head parallel to the neck of the toothbrush, then slide the head towards the handle until it lock clicks into place. Check that the brush head is firmly attached. Do not insert the brush head at an angle. So we can help further, please call us at (800) 566-7252.

We're so sorry your toothbrushes stopped working so soon, and are here to help. Please know, all of our products are thoroughly evaluated to ensure they reach you in perfect condition, and we would expect these toothbrushes to last around four years. So that we can help you further, please give us a call at (800) 566-7252.

We want you to be able to use your toothbrushes you purchased, Shirley, and we're very sorry that this happened twice, and we're happy to help you. We go through many quality checks through making them to ensure functional brushes, so this is not something we would expect to happen before even using it. Please check to make sure the batteries are correctly inserted in the battery compartment (with the plus and minus signs in the right position). Also, you may want to try new AA batteries. We always want to know what is going on with our products, so we'd appreciate you calling us at (800) 566-7252 for assistance getting it working.