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PTFE wont do anything for that kind of joint. You will have to unscrew both of those connections and look at the rubber compression rings inside (use an old towel to catch any drips, and the bottom of the U will be full of water). If they have broken you can buy the whole trap part, which will include both of the compression rings, for a few quid from Screwfix. It doesn't need anything, just make sure the black pipe is pushed in all the way, and that rubber O rings are compressed adequately at both joints to seal the joint.
Invent
Just had water dripping through the hall ceiling, it was while the bath was draining so I took off the panel and saw this. It tightened a fraction by hand so i reckon I’m onto the cause here, plus the floor underneath was sodden.
Is the longer fix just a case of removing, cleaning, adding some ptfe tape or should I be replacing the white bits?