Quranic verses in Sura Yousuf are the strongest evidence in this matter.
Prophet Yousuf told his brothers: Take this shirt of mine and cast it on the face of my father, he will turn clear-sighted. (12:93).
'We have many authentic narrations on the blessings which can be obtained by touching (Masah) of blessed items like Black stone, Zareeh of most humble servants of Allah, Quranic text, etc.
No, you do not need to take them off when you go to the bathroom, as long as you are certain they will not be contaminated with any najasah, and you keep them away from any impurity, or from you touching it without wudhu.
Otherwise, you can take them off.
Another suggestion would be to paint a layer of clear-colour nail polish.
Wearing Aqeeq is recommended according to authentic Hadeeths. It is not Shirk at all to wear Aqeeq because we never think that the Aqeeq is partner of Allah in any way. Allah kept certain benefits in certain things in His creatures. Benefits of wearing Aqeeq is a gift from Allah.
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