It's a crushing blow for the anti-fluoride movement, but a victory for common sense.
Many anti-fluoride arguments centre on the evils of mass medication, but the High Court says fluoridation is not medication and is akin to chlorination of water or adding iodine to salt.
Others say it should be personal choice whether to ingest fluoride, but that argument only goes so far.
Yes parents should be expected to get their kids brushing their teeth, but sadly not all mums and dads are Parents of the Year. You may not like Nanny State, but some kids whose parents are hopeless need a nanny.
Hopefully the High Court decision will be seen as a signal to official bodies nationwide to move ahead and do what's best for the people.
In Rotorua we don't have fluoride in the water - this is a good opportunity to start asking why, how and when.