Bests & Worsts Reviews from Amazon

All of us buy generic brush head replacements (bhr for short) because we are trying to save money over the name brands and at least get comparable use. So I worked this out based on the cost per use and using my experience and the other poor reviews. At the time of writing this the price per generic bhr was $00.67, so if the price changes you can still plug in the new price per item in the calculation. I did buy the pack of 20 at a higher price and so far each bhr has lasted about a week for me. As mentioned by other people the internal mechanism in each brh comes apart and it stops oscillating. Basically you end up with a glorified toothbrush and have to attach a new one. The comparable Oral-B name brands I looked at on Amazon are approximately $20 for three bhrs. Working on the assumption that each Oral-B bhr is recommended for 3-4 months of use and there are no quality issues. COST CALCULATION (free shipping option): 3 months of use per Oral-B bhr (pack of 3) equals a total of 9 months of use for $20. If each generic bhr lasts.... 1 week then $00.67 * 36 (there are 36 one week periods in 9 months) = $24.12 1.5 weeks then $00.67 * 24 (there are 24 one and a half week periods in 9 months) = $16.08 2 weeks then $00.67 * 18 (there are 18 two week periods in 9 months) = $12.06 4 months of use per Oral-B bhr (pack of 3) equals a total of 12 months of use for $20. If each generic bhr lasts.... 1 week then $00.67 * 52 (there are 52 one week periods in 12 months) = $34.84 1.5 weeks then $00.67 * 34.6 (there are 34.6 one and a half week periods in 12 months) = $23.18 2 weeks then $00.67 * 26 (there are 26 two week periods in 12 months) = $17.42 CONCLUSION: 9 months of use: Generic is between $12-$24 vs. Oral-B for $20. 12 months of use: Generic is between $17-$35 vs. Oral-B for $20. Assuming the quality (good or bad) is consistent for any brand you buy, factors such as number of times you brush a day (I brush twice a day), brush time and the force you use has an effect on the lifespan of a bhr. You'll SAVE MONEY IF each generic bhr lasts at least 1.5 weeks and you used to change each Oral-B bhr every 3 months OR if each generic bhr lasts at least 2 weeks and you used to change each Oral-B bhr every 4 months. It appears like you're getting a good deal because of the number of bhrs in a pack, but in all likelihood this generic brand will COST YOU AS MUCH OR MORE than the name brand if you brush twice a day. You MAY save money if you brush once a day and are gentle, in which case it's a buy and try scenario. IMHO...The quality per generic bhr may be very inconsistent, hence the inconsistent reviews. The first bhr I used vibrated too much because it didn't fit properly and lasted just under a week, the others fit properly and lasted about a week (still got a bunch more to go). I gave this one star because more money spent not saved. I will not buy again! The only advantage a generic could have over the name brand is that by using a new bhr more frequently it's more sanitary (again it's only my opinion). The price may be dropping to make it a better deal compared to the name brand, however for me it would have to drop significantly to be worthwhile for a one-week per bhr lifespan. The only reasonably priced quality generic I've had a good experience with so far is the Walgreens brand.