三個月換一把牙刷，六個月洗一次牙之類的謊言，都是為了賺錢而專門設計出來的騙局。

所有跟帖： 

• Disagree. dental cleaning every 6 months is important -nasdaq100- ♂ (0 bytes) () 02/15/2015 postreply 16:08:28

• +1 , preventative is most important step . -ReOli- ♀ (0 bytes) () 02/15/2015 postreply 23:54:00

• every 6 month cleaning is very important step to maintain dental -fangyangmama- ♀ (0 bytes) () 02/16/2015 postreply 08:00:30

• 世界上的動物都不洗牙，為何人類獨獨需要？ -pp666- ♂ (0 bytes) () 02/16/2015 postreply 12:27:27

• 你又如何知道動物的牙痛和痛苦？ -cyberbug- ♂ (0 bytes) () 02/16/2015 postreply 14:02:58