It depends whether you're using a shampoo that's strong enough to wash off the cones so they don't build up. The cones themselves may help your fragile ends be stronger and shinier/less tangly and can lock in the moisture from the shower (though they may lock out any moisture treatments you do AFTER you shower).
On the other hand the stuff it takes to wash them off can be drying to hair. It all depends how well your hair handles that kind of thing. Me personally I avoid cones not because they're bad or evil or anything but because I don't want to be obliged to use strong cleansers to wash them off all the time. It's the cleansers my hair and scalp object to, not the cones themselves. Remember everyone's hair is different though
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