These are a common phenomenon that can otherwise mar a great smile and are caused by enamel demineralization. Patients can do two things to help these white areas to blend with the rest of the tooth.
First, they should brush with a toothpaste containing amorphous calcium phosphate (ACP). Second, they can apply fluoride daily to teeth in low concentrations in the form of toothpaste, home rinses (such as ACT), and a dental varnish applied directly by the dentist.
These remedies can take awhile to produce the desired changes. However, for a more immediate and instantaneous solution, dental bonding produces an excellent result.