“The causes of thickened and grey toenails are as follows.
Thickened and grey toenails are mostly considered to be caused by fungal infections or caused by age factors.
Fungal infections affect the growth of the toenail and promote the build-up of keratin around it, resulting in a thickened, cloudy and grey nail.
In addition, as we age, the metabolism of the cuticle of the toenail slows down, the calcium in the toenail decreases and the iron increases, resulting in malnutrition of the toenail, which can also result in a significant thickening of the toenail and a grey, dirty feeling.”