It worked for me. Takes awhile for you notice a difference, but when I stick with it, I end up forgetting that my teeth were sensitive. Both hot and cold liquids would bother me - especially cold.

If he really believed that, it would already be off.

Part of the problem is operator precedence - it’s ORing together the three numbers, then comparing that to “coin”.

5 = 00101
10= 01010
25= 11001
    11111 = 31 

It’s testing if coin equals 31.

Eastern Sea? Is that like the Gulf of America…

I always hated tipping culture, this device’s creator may be the hero we need to end it.