and would also. . It is clear that some verbs take gerunds, some verbs take infinitives, and some verbs take either. The following tables of verbs should help you understand the various options that regulate our choice of infinitive or gerund.
There are a variety of other inflammatory diseases that can produce excessive scaling and therefore dandruff, including psoriasis, fungal infection of the scalp skin (tinea capitis), and allergic contact dermatitis.
People that say dandruff is the direct cause hair loss need to check where they are getting their information. In research thus far, very little evidence points to the idea that there is a cause effect relationship between these conditions. Dandruff is highly unlikely to cause permanent hair loss.