Colgate - Optic White - (Toothbrush +) Built-In Whitening Pen

I got this on sale! :D
For this review the focus will be on the pen, not the brush.

This pen contains a 4.5% hydrogen peroxide paste.
Instructions say apply two clicks to the top teeth and bottom teeth, twice a day for three days.

Before treatment.

After three days.

I don't see much difference.
Price: ($19.99 for toothbrush and pen)
Scent: 1/5 (mild hydrogen peroxide smell)
Effectiveness: 0/5

Art break - Thermochromatic Pen

When I was younger, I had a pen which looked black, but changed colour when it was heated up.
The ink itself was just normal ink, but the casing was thermochromatic.
Thermochromatic = changes colour in response to heat.

One way to do this is using liquid crystals (like in your LCD television).

I was reminded of this pen (long since lost in the folds of time) whilst watching SimplyNailogical's thermochromatic nails video.

I couldn't see why this couldn't be applied to a pen casing.

So I grabbed a pen and painted it in black acrylic paint.

I have a million of these pens!

Then I put on two thick layers of Solar Colour Dust liquid crystal paint. (They also sent me a sample of holographic glitter! <3)

Looks so unassuming!

Don't worry, it dries clear!

So far so good!

Finally, a sealing coat of top coat nail polish.

Verdict: I LOVE IT!