What is best treatment for follicular tonsilitis?

Tonsillitis. If this is chronic and symptomatic best would be to consider tonsillectomy.
Irriagte or surgery. You can irrigate your tonsils to clean out the crypts (the pits). This can be very helpful. You can gargle with salt water after you eat. If this does not control it, consider an evaluation for a tonsillectomy (removal of your tonsils).