These work well for testing saliva alkalinity.
I bought these because I'm trying to keep my saliva alkaline.<br /><br />On the plus side, these are good for testing alkalinity.  You can eat or drink something, then use these to test your saliva to see if it's acid or alkaline.  I was able to verify, for example, that xylitol makes my mouth very alkaline, so should be good for preventing cavities.<br /><br />On the minus side, the colors change as they dry.  And they're a little pricey.<br /><br />All in all though, I like them.  They work well and are easy use.
Rating: 4 stars