Can I use Crest gum detoxify tooth paste with supersmile products?

What type of tooth paste do you recommend for teeth that are brittle. I have been using Crest gum detoxify and whitening. I need an over the counter product cannot afford to go to dentist.

I left a full syringe of Kor gel on my bathroom counter for 3 days. Is it salvageable?

It has been while since the dental person demonstrated the proper way to inject the gel so can you tell me where do I inject the gel?

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