A. White spots often occur on front teeth, the main reason is often that you were ill when you were about 4 years old when that tooth was developing, the most common causes are severe influenza and chicken pox.  You need to find a good cosmetic dentist who will shine a light through the tooth to assess the depth of the white sopt.  The best treatment is microabrasion to gently remove the top layer of the white spot then a cosmetic tooth coloured filling can be placed over the spot and hide it.  Porcelain veneers in my option are far to destructive an option.