I have been a Sonicare user for 8 years. I used to love this product because it cleaned my teeth really well and the brush heads lasted a long time. I get my teeth professionally cleaned every 6 months, and I used to replace the brush head every time I got my teeth cleaned. During those times, when I would throw the old brush head away, I would notice that the brush was still in pretty good condition, even after 6 months of use. However, in the last year, I'm finding that my Phillips replacement heads are starting to show significant wear in as little as 2-3 weeks. For instance, I have been using my current replacement head for 2 1/2 weeks now. Over 20 bristles on the outside edge are now splayed outward, and I've had bristles come out of the brush and get left in my mouth twice in the last week. The brush head is now unattractive because of the splaying bristles and unpleasant to use because of the bristles falling out, so I will replace the brush head tomorrow. The disappointing thing is that I've found that I used to be able to replace these brush heads every six months when I got a professional cleaning and the heads were still in decent shape, but now I'm replacing them every 3 weeks because they're starting to look worn and leaving bristles in my mouth. Replacing brush heads is now costing me 8 times as much as it used to, and I simply cannot afford it any more at the prices Philips charges. I wish that the replacements performed for me like they used too, but I'm going to have to start using something different. I feel bad now that I've recommended this product to lots of friends and family members over the years and it's no longer working as good as it used to. I hope they're not having the same issues. I'll ask my dentist what he thinks I should use now when I get my teeth cleaned next month. After all, he's the person who recommended Sonicare to me 8 years ago.