I know this is controversial but the fluoride they put in toothpaste is different to naturally occurring fluorine, and is toxic. It’s a by-product of aluminum manufacturing that can also be found in rat poisons and industrial pesticides.
Also commonly found in toothpaste are saccharin, sugar, sodium laurel sulphate – invented as a degreaser in garages, propylene glycol – a petroleum- based chemical anti-freeze, DEA or diethanolamine is used in products that foam, including toothpaste (DEA disrupts hormones and forms cancer-causing nitrates); artificial food dyes like yellow no. 10 and blue no. 1- some of the worst colourants