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BEST FAQ
- [How to use] How to use the device?
- [Products] What does it mean to be...
- [Products] How long should I use bettra?
- [Products] Does it require any special...
- [Products] Can a healthy person use...
- [Products] Are there any side effects?
- [Others] Is Bettra as effective as...
- [Others] What is high frequency...
- [Free home trial] What is free home trial?
- [Exchanges and Returns] I would like to return it.