Incisors are the maxillary incisors. Removal of maxillary incisors at the age of four usually has no effect on articulation, but it has some effect on speech as follows.
Pronunciation is controlled by the articulatory organs, including the vocal cords, vestibular folds, and laryngeal muscles, which can still be articulated after removal of the maxillary incisors.
The oral cavity is involved in articulation and is the resonating organ of speech, so morphological abnormalities of the oral cavity usually have a significant impact on speech, including tooth loss, of which the missing front teeth have the greatest impact, especially the maxillary anterior teeth. Dental sounds, such as “s” and “z”, and labiodental sounds, such as “f” and “v”, may be affected.
If you experience any of these symptoms, it is recommended that you visit a hospital and receive professional treatment as soon as possible.