These fit perfect. You have to know when your old brushes are due. You will know when your teeth just don't feel as clean as they are with the new brushes. My guess is 3/4 months at most. I bought to packs.
After reading the mostly positive reviews about how users were achieving real results in 7 days I decide to give it a try. I received my kit earlier than expected just before Christmas Eve. After one 15 minute application I could already see my teeth were whiter and brighter I was thrilled! After 7 days my teeth were noticeably several shades whiter not only to me but to my friends. Any sensitivity was controlled with the remineralizing gel. If you have metal filling be careful not to get the whitening gel on it or it will cause an aching discomfort on that tooth. Other than that I'm very happy with the product and will order refills to keep my new smile white.
I ordered the Bluestone Rechargeable Sonic toothbrush for my husband and myself but our grandkids love it and because it comes with 12 extra heads they can have their own toothbrush head. Love the different levels and the kids love the pulsating setting. It's thorough but gentle so we all love it. Purchased it nearly 2 years ago and it has out performed others we owned in the past. Very pleased and highly recommend.
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