And you're basically supposed to do the same thing twice a day with your toothpaste, which is why the tube says "spit out after brushing" and not "make a little cup with your hand and use it to swish some water from the sink around in your mouth, rinsing most of the fluoride off before it has a chance to work".
The blue light filter works for some people. Not sure what the iOS equivalent is called but on Android you can just search the settings for Night Light.
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