After years of colour many people make the decision to let their natural, grey hair take over. Having grey/white hair all over can be very beautiful, but the transition between colouring your hair and letting it go grey can be an awkward one. However, the transition doesn't have to be as painful as it may seem.
Get highlights and/or lowlights to blend the colours. Growing out your grey hair will leave a stark contrast between your coloured hair and your natural colour of hair. A professional stylist will be able to make this line a little less harsh by blending light and dark colours in the area where there is a line of colour. Before you decide to get highlights or lowlights, let your hair grow out as much as possible -- about 3.8 cm (1 1/2 inches) -- to make it easier to match and blend. Because grey and white are difficult hair colours to create this won't lead to flawless hair, but it will help get rid of the line between the colouring and the new growth.
Get a shorter haircut, or get haircuts often. The more you cut off the quicker you will have completely grey hair. The grey hair will eventually be the entire length of your hair so you have to keep in mind it will grow back if you cut it.
Take extra care of your hair. In order to keep grey hair looking good it has to be in good condition. Once the colour is stripped from the hair it is more likely to frizz and fray, so the more you take care of it the better it will look. Put a deep conditioning mask on your hair at least once a week (more often in the winter), drink lots of water to keep hydrated and make sure you have protein in your diet. Use products, such as shine products that will help the hair lay better.