Filling in a small crack in tile grout?

[mac456]

Hi guys,
What is the best way to fill in this hairline crack in the grout? silicon or filling with some extra grout?

The crack is only on the one tile at the very top of the shower.

Thanks

 

[JayJay1978]

Silicone should be down that internal corner, scrape out all that grout that has no right to be there...

 

[mac456]

Thanks

 

[mac456]

Would this tool be good enough for the job?

https://www.screwfix.com/p/pro-grou...gclsrc=aw.ds&dclid=CLOWx9-uh9sCFQsT0wod33AMzg

 

[bobasd]

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.

 

[mac456]

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.

Ok makes, so ensentially rake the cracks themselves and fill the raked gaps with silicon?