Wednesday, 25 December 2013

Merry Christmas

A quiet, cool day.

Thursday, 19 December 2013

Colgate Maximum Cavity Protection

This is a post I started late last year. Its been resting in 'Drafts' for some time. As part of the clean up for the end of this year, I've just finished the references and here it is:


I was looking my tube of toothpaste: Colgate Maximum Cavity Protection.  There is a little drop with 'Liquid Calcium" written underneath the writing.

I'm not the first to wonder:

http://fortheluvofscience.wordpress.com/2012/04/23/liquid-calcium-wait-really/
http://www.sciencemadness.org/talk/viewthread.php?tid=8792
http://metabunk.org/threads/1213-Toothpaste-Liquid-calcium


The claim of 'liquid calcium' had me thinking. It sounds like it is giving calcium to your teeth - which would be a good thing. But Calcium melts at 842 Celsius, so that claim is clearly not true. Maybe they mean that it provides calcium ions in solution when your brushing?

I decided to check this out. The "active" ingredients on the tube do not list calcium in it at all.

The fine print on the tube refers you to www.colgate.com.au for more information. But there is no more information shown for Colgate Maximum Cavity Protection.

Looking about the Australian site for Colgate, there isn't very much information besides the advertising spiel. Even for their Colgate Total range, which they did have an option for "more information" only gives more advertising speak.

For the Australian product:

INGREDIENTS Active:
Active Ingredients: per tube: Sodium monofluorophosphate 0.76% W/W, Sodium fluoride 0.10% W/W 

Then on the back is:

Ingredients: Dicalcium phosphate dihydrate, water, sorbitol, sodium lauryl sulfate, cellulose gum, flavor, Sodium monofluorophosphate,  tetrasodium pyrophosphate, sodium saccharin, Sodium fluoride, CL 42090

The First ingredient is calcium. Dicalcium - looks promising. Di, being the prefix meaning two. Twice the calcium? But, don't be fooled.

Before we start, a quick rundown on tooth decay.

Dental decay is when the rate of minerals lost from the teeth exceed the rate they are deposited. Bacteria break down foods, and release acid, which erodes the enamel causing  minerals to be lost. Saliva washes the acid away, and provides calcium ions to replace the mineral lost, restoring the enamel. Acidic foods also demineralize the teeth, just like excessive vomiting. Tooth enamel can also be lost by excessive abrasion - brushing too often.

Looking at all the ingredients:

Dicalcium phosphate dihydrate  does not provide any calcium ions as its classed as practically insoluble in water.  In toothpaste it used as a tartar control agent.  What this means is that it is an abrasive.  Rubbing between the toothbrush and your teeth will grind off any tartar.

It is used to provide a form of calcium in food: breakfast cereals, enriched flour and noodles. But the calcium here is available after digestive acids have acted on it.

Since saliva is 99.5% water, not much is going to dissolve.

Water - Depends on the water. If its pure water its not going to have any calcium in it, but assuming its a normal drinking water source, it is a possibility that there might be some calcium in it. See below under 'flavour'. The water could have "processing aids" in it.

sorbitol - Is a sugar substitute, a thickener, that also retains moisture.

sodium lauryl sulfate -   Used as a surfactant. Interestingly, a study has suggested that it could be decreasing the effectiveness of fluoride in toothpaste.

Reduces sweetness - as seen when having sweets after using toothpaste.

cellulose gum-   Also known as Carboxymethyl cellulose, but cellulose gum sounds better. Used as a thickener.

flavour - no idea what this is, as it is not required to be disclosed. Australia only requires that if a flavor or flavoring is used that it is listed as 'flavouring' or 'flavour'.  Since the toothpaste is 'cool mint' flavour, its 'cool mint' of some sort.

Actually reading the Australian New Zealand food standards is an enlightening process. "Processing aids" do not have to appear in the ingredients list. This standard lists off all the acceptable aids used that don't have to be listed as an ingredient:

antifoam agents
catalysts
decolourants, clarifying, filtration and adsorbent agents
desiccating preparations
ion exchange resins
lubricants, release and anti-stick agents
carriers, solvents and diluents
processing aids used in packaged water and in water used as an ingredient in other foods
bleaching agents, washing and peeling agents
extraction solvents
enzymes of animal origin
enzymes of plant origin
enzymes of microbial origin
microbial nutrients and microbial nutrient adjuncts
Dimethyl dicarbonate as a microbial control agent
and finally processing aids with miscellaneous functions

Some agents have a limit for how much can appear in the food. For most of the agents, the amount used is listed as "GMP" (Good Manufacturing Practice).  I cannot find a definition of that, but it seems to be to only use enough to get the job done. I didn't find anything that said how much that is either.

Sodium monofluorophosphate is the active ingredient, and is providing fluoride ions. It has been found that fluoride in the remineralization makes a more acid resistant enamel. So this is not a bad thing. The amount in toothpaste is less than 1%.  Each 175 gram tube has 1.3 grams in it. Not much.

Makes me wonder just how much are you getting when using a small amount of toothpaste.

tetrasodium pyrophosphate - is used as a buffering agent, an emulsifier, a dispersing agent and a thickener.
In toothpaste its used for tartar control by removing calcium and magnesium from saliva to stop them being deposited on the teeth.

sodium saccharin - An artificial sugar substitute.

Sodium Fluoride  Provides fluoride ions.

CL 42090 A color agent. Provides the blue color to toothpaste.

So this toothpaste

1. Does not provide any calcium at all, and
2. is removing the calcium in your saliva

How is this not false advertising then?

Wednesday, 18 December 2013

Sydney Early Preparations

Still hanging about in Sydney. Been reading a lot, walking, riding and experimenting with a new cooking setup using alcohol stoves. Had me collecting aluminium tins for a bit and making different stove models. After a lot of trying, I'm going to stick to my MSR for cycling. Alcohol stoves have their place, but I prefer the MSR experience.

In the new year I'll be on the road again (More on this in another post). With that in mind I started testing my gear out. Some of it hasn't rested well. First time using the MSR stove, fuel sprayed out of the adjustment knob. Seals had gone hard with age. I suspect that the heat of inside the van didn't help them at all.

Not to worry. Had this happen before and it was soon fixed and a great meal cooked up.


I had hoped to do some hiking, but having troubles with a sore back. Even when carrying a light day pack. Its only when carrying a pack. Cycling is no problem. In fact, cycling seems to make it better. So, going to give the hiking idea away for the moment and continue with cycling.

Will be staying in Sydney for the Xmas period. I have some things to do early in the near year, and traveling outwards from Sydney at Xmas time with all the crowds heading out for holidays, finding a spot close by, and then travelling back with the crowds doesn't appeal to me.  With all the people that leave, Sydney will be quiet. So I'll stay about a bit longer.