Re:Show HN: I invented a caffeinated toothpaste
by femto on Friday September 16, 2016 @02:18AM
(#12512209)
By those numbers the 70 gram tube contains approximately 5-6 grams of caffeine? LD50 level for caffeine is estimated at 200mg/kg of body weight [2], so the tube could kill a 25kg person? I hope that the fresh minty taste isn't too attractive to children, as the lethal dose to a small child looks to be substantially less than one tube.
By comparison, about two (100g?) tubes of fluoridated toothpaste could kill a 10kg (2yr old) child [2], so a child is unlikely to die from scoffing an open tube of toothpaste that they find in the house.
Perhaps you should look at either the caffeine concentration or tube size, to ensure that an incidental poisoning can't occur due to a single open tube.
[1] https://en.wikipedia.org/wiki/Caffeine#Overdose [2] http://health.howstuffworks.com/wellness/oral-care/kids/what...
Re:Show HN: I invented a caffeinated toothpaste
by schrodinger on Friday September 16, 2016 @05:39AM
(#12512842)
Isn't caffeine a pretty strong acid? I'm really wondering if this is any good for your teeth.
Re:Show HN: I invented a caffeinated toothpaste
by AstralStorm on Friday September 16, 2016 @12:53PM
(#12515360)
It is probably neutralised as otherwise the toothpaste wouldn't be effective. Increasing pH is one of the mechanisms killing bacteria and preventing decay.
2) (almost) immediate shipping. I have a few hundred units fully packed and ready to ship. I put a label on them and USPS picks them up! So it might be a day or two before it gets shipped. More inventory that needs to be packed before shipment.
3) Addressed this elsewhere in greater detail elsewhere, but as an adult you need less fluoride than children, and you may be getting fluoride in your water. I might suggest looking into a fluoridated mouthwash, sold at pretty much any pharmacy. I also don't reccomend Power Toothpaste before bed, so you might use a regular, fluoridated toothpaste :)
Thanks for all of the questions!