Generally speaking too much of anything is not good for you.
As for vibrators the same is true. You start off small and then You eventually need something a lot stronger.
You should use these devices sparingly.
Also you probably shouldn't use these devices for more than half hour at a time, not sure why they don't come with a warning. (do they think people don't last more than half hour?)
If you look at any other massage device they have a warning that states do not exceed half hour of use. Walk into your local Bed Bath and Beyond and take a look at the warning.
There is more than just Nerve getting desensitized. Too much use could cause muscle damage.
(ever see those adds for the electric pumps that will excersise for you? They are not good for you and Will never do what they claim!)
Hope that helps.
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