Depends what you call deep! Quite deep enough for me! When i had problems, at first i got irritation, and in hours my body seemed to reject, as it fell off, i was sent a replacement, tried again with the 2nd sensor, got irritation, it was thought this could be the adhesive, and some of the problems prob were with the first one, but i had been given a presc for spray on skin protector by then, to stop any irritation which it did, but still pain and burning inside my arm, after few days , ok for first day, beginning to irritate after 2nd.etc, led me to phone libre and they said take it out immediately, i did, and it is not what i call short, i thought it was much like my pump needle, except made of some material that is not steel. i tried the replacement sensor and things got worse quicker, , libre very helpful, and said remove. Libre advised report to GP. Who said not to use again. Pain, intense, INSIDE arm for weeks, gradually fading. I have had allergies for more than half a century, most ease off in days when you remove contact with the allergen, with this it took longer. Libre good, got things refunded. apart from people who have allergies, i would recommend. As far as i was concerned the sensor/needle was deep in my arm. Too deep. I wait for other products that are upcoming, hoping they wil be ok for me.
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