Some considerations for people taking vitamin C include the following:
Many chewable vitamin C products contain sugar, and all are highly acidic (which can be damaging to tooth enamel). It is probably a good idea to brush your teeth after taking a dose of a chewable vitamin C product.
The more vitamin C you take, the more that gets excreted through your urine. In other words, while taking high doses of vitamin C is usually not dangerous, but it is not usually beneficial either.
If you are unsure about anything related to your dosage or vitamin C dosing in general, please talk with your healthcare provider or pharmacist.