your tiles are poorly set.they are jammed up against each other with hardly any grout space so any slight movement will cause grout cracking. the grout lines i can see apper to be just smeared more on the joins not so much in them.
but rake out the inside corner,as above, with the rake tool or just a stanley knife will do.wear glasses.and fill with silicone.
do the same where the tile hits the ceiling.
the odds are that cracks will happen again in a year or so.
your tiles are poorly set.they are jammed up against each other with hardly any grout space so any slight movement will cause grout cracking. the grout lines i can see apper to be just smeared more on the joins not so much in them.
but rake out the inside corner,as above, with the rake tool or just a stanley knife will do.wear glasses.and fill with silicone.
do the same where the tile hits the ceiling.
the odds are that cracks will happen again in a year or so.
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