At least three kinds: (1) problems related to appearance; (2) functional problems, including difficulties in jaw movement (pain and lack of muscle coordination), problems in chewing, and problems in articulation and the production of speech; (3) greater risk of trauma due to protruding teeth and also greater risk of periodontal disease (gum disease) and tooth decay as well as dental deterioration and wear caused by malocclusion.
Neid on vähemalt kolme liiki: 1) kosmeetilised defektid; 2) funktsionaalsed probleemid, kaasa arvatud raskused lõualuu liigutamisel (valulikkus ja lihaste puudulik koostöö), mälumishäired ning hääldamis - ja kõnelemisraskused; 3) suurem traumade oht, mis on tingitud tugevalt ettepoole ulatuvatest hammastest, peale selle tekivad kergemini hammast ümbritsevate kudede (igeme) haigused ning hambakaaries, samuti on suurem hammaste lagunemise ja kulumise oht, mida põhjustab vale hambumus.