Hi Dalediane,
WoW. Thanks for digging up the "Easy Fluoride Treatments" tip, from 3 years ago. My how time flies.
BUT, it's still a very valuable tip. Thanks Re: "I, too use 5000 PPM Fluoride toothpaste and you are WAY OFF. I am not trying to sound mean I just don't know where you got your FACTS FROM. The % of Fluoride is 1.1% NOT 0.5%"
The % of sodium fluoride is 1.1%, not the % of fluoride.
5000ppm fluoride means 5,000 / 1,000,000, or 5 / 1,000 or 0.5%. So, 5000ppm fluoride means 0.5% fluoride.
The difference is that Sodium Fluoride contains Fluoride. When sodium fluoride dissolves in water, it ionizes into sodium and fluoride ions.
If I may try your patience, here's a nostalgic trip back to high school chemistry:
Atomic weights
Sodium = 22.989. Let's call it 23.
Fluoride = 18.998 Let's call it 19.
Sodium Fluoride molecular weight = 23 19 = 42.
Fluoride is 19/42 or 45.2% of the weight of Sodium Fluoride.
So, 5000ppm Fluoride / .452 = 11,000 ppm Sodium Fluoride = 1.1% Sodium Fluoride.
So, prescription strength 5000 ppm (or 0.5%) fluoride toothpaste, contains 1.1% Sodium Fluoride.
Some toothpastes contain sodium monofluorophosphate. That has a different molecular weight.
My regular Colgate lists "0.15% w/v fluoride ion". That would be 1500ppm. So, prescription toothpaste, with 5000ppm Fluoride (0.5%) has 3.3 times more fluoride.
Re: "a NaF of 0.312% w/w (1,450
ppm fluoride) is not uncommon"
Your numbers agree pretty closely with my calculations: Converting NaF (sodium Fluoride) to fluoride: 1450ppm fluoride (0.145%) divided by 0.452 = .320% Sodium fluoride (NaF).
Does that help? Have you tried meditation?
Best regards, EngineerGuy