Ceramic discs do wear out and the tap will eventually drip however replacements are available and good news manufacturers seem to be using relatively few sizes as standard.
How to change a ceramic washer on a mixer tap.
With washer taps both the tap seat and the washer suffer wear the tap seat by the flow of water and the washer by the actual activity of forcing the washer onto the seat.
Remove the spindle from basin and then remove the tap valve.
It should be smooth to touch and free of any blackened build up.
How to remove the washer from a mixer tap that s leaking from the base of the neck.
Use an allen key of the correct size to undo the bolt holding on the top section of the tap.
You will need a tube spanner or adjustable spanner for this depending on which taps you are repairing.
The internal washers can wear out and allow water to leak from the neck b.
Use your fingers or the needle nose pliers to slide and press the new washer into place.
A disc retaining washer b ceramic discs c o ring which stops any water seepage up to the head of the tap d valve retaining nut e spindle on which the handle sits.
Place the new washer and old screw nut onto the bottom of the tap stem.
In photo 2 we can see the parts we are concerned with.
U se a flat blade screwdriver to remove the hot cold button from the handle of the tap requiring a new ceramic cartridge.
Before you replace the tap valve inspect the tap seat for signs of aging or damage.
Then if your tap stem uses a screw or nut use the screwdriver or pliers to tighten the screw nut back in place.