Hi and welcome,
Holes seen in the teeth indicates the presence of dental caries
. It is bacterial invasion of the tooth which leads to tooth decay
and progresses deeper in the dental tissue if not treated in time.
dont be afraid to visit a dentist
as restoring the tooth to its normal condition is not a painful process at all.
your dentist will take x ray
of the teeth with decay, accordingly the decayed portion of the tooth is drilled out and the cavities are filled with permanent fillings. If there is deeper infection touching the dental nerves then he treatment option is root canal treatment
. i suggest you to visit a dentist as soon as possible before the condition gets worse.