Introduction

Lisp is a speech disorder that affects a person's ability to pronounce certain sounds and communicate effectively. It occurs when the tongue and teeth are incorrectly placed. When you say s or z, your tongue tip should come into contact with the roof of your mouth, just behind the front teeth. In lisps, the tongue may protrude between the front teeth. The sound is pronounced more like a 'th' than a `s ` or ` z`.^1,3

Lisp is a common problem, that affects both children and adults. It can occur at any age but is most commonly seen in children during their speech development years. In adults, it can be a residual condition that has existed since childhood.

Lisps affect approximately 23% of the population in the United States at some point in their lives. It is one of the most prevalent speech disorders in the United States.

Various factors can cause lisps, the majority of which begin during childhood. This article will discuss the causes, types, and potential treatments for this speech disorder.

What are the causative factors for lisps?

Developmental factors:

• As a child, you may have learned incorrect ways of producing the s or z sounds and never learned how to correct these habits.¹

Anatomical abnormalities:

Tongue ties

A common cause of lisps is tongue tie, also known as "ankyloglossia." It is a condition in which the tongue is connected to the bottom of the mouth by a tight band of tissues. This hinders the tongue's normal motion, making it more challenging to make certain sounds.²

Tongue thrust

It is an orofacial myofunctional disorder characterised by the tongue protruding further forward than normal. This obstructs the airflow needed to produce specific sounds.

Misaligned jaw or teeth

A misaligned jaw can make it difficult to pronounce sibilant words (which require a stream of air directed towards your teeth with your tongue). 

Dental abnormalities:

Lisp can be seen in people with dental abnormalities like an overbite, open bite, or narrow dental arch.

What are the different types of lisps?

Lisps can be divided into several categories based on various factors and causes. The most common types of lisps are discussed below.

Interdental (Frontal lisp)

Interdental lisp occurs when the tongue protrudes between the front teeth while pronouncing s or z. It is the most common type. This causes the's' and 'z' sounds to sound more like 'th' sounds. In words such as “soup”, and “baseball” it might sound like a “thoop”, or “batheball” It generally resolves by the time a child is 4.5 years old.¹

Dental lisp

In dental lisp, the tongue touches the front teeth for the sounds “s” or ”z”. The tongue doesn`t protrude outside of the mouth. Instead, the air is blocked at the furthest point forward in the mouth.¹

Lateral lisp

Air escapes over the sides of the tongue, causing the sound (s or z) to become distorted. Because salivary sounds can be heard, a lateral lisp frequently sounds "wet" or "slushy."¹

Palatal lisp

It happens when the middle portion of the tongue obstructs air at the hard or soft palate. Among all, it is the least prevalent. It is not a part of normal development, unlike interdental or dental lisps.¹

Nasal lisp

It is the type where the entire air stream is escaping through the nose, making the voice sound, with no air escaping through the mouth.

Strident lisp

In strident lisp due to the incomplete closure of the tongue and the palate or teeth, the high-pitched whistling sound escapes from the oral cavity.

Why is it important to address the lisp?

Early intervention is essential for lisp treatment to avoid long-term effects. It might affect a person's self-esteem and cause communication issues. A person affected by lisp may try to avoid social situations that can create isolation. As a result, we must become aware of the various treatment options available for dealing with lisp problems. Speech therapy is one such approach that can help us.

What is speech therapy and its goals?

Speech therapy, also known as articulation therapy, is the most effective way to treat a lisp.² It is beneficial to both adults and children with lisps. We can successfully treat lisps if it is identified and addressed early on. Speech therapy can be beneficial in this situation. It helps people overcome their lisps. 

Individuals who struggle with speech can improve their communication with speech therapy. Speech therapy works primarily to improve pronunciation, build up the speech muscles, and teach people how to speak correctly.³ It uses a variety of methods to teach people in one-on-one sessions, such as:

• Perception exercises to distinguish sounds and syllables
• Working on certain sounds and making speech flow better
• Exercises for improving breathing, swallowing, and voice
• Utilizing tools like computer-assisted speech, communication boards, and sign language to help with communication.
• Advising people in need of speech therapy, their parents, and other family members
• Helping with implementing these measures in everyday life³

The speech-language pathologist can figure out what kind of lisp the person has and how bad it is, then customise the therapy.

How can speech therapy help in lisping?

By participating in speech therapy, one can experience significant improvements in the clarity of their speech, as well as in their self-esteem and their ability to interact with others. Many people improve their communication skills, which can have a positive impact on academic performance and personal relationships.²

During one-on-one sessions, a speech therapist can teach specific exercises to help an individual correct lisp issue. A therapist can also help people achieve their goals by teaching them how to practice at home.²

Speech therapy for lisping usually involves exercises and techniques that help fix the position and movement of the tongue and other speech organs that make sibilant sounds.³ The approach and duration of therapy can change based on the person's age, how significant their lisp is, and other factors.

In articulation therapy (speech therapy) individuals are taught the proper way to place their tongues when pronouncing the /s/ and /z/ sounds through specific exercises and practices by various methods such as:

Visual and Tactile Cues

During articulation therapy, speech therapists use drawings or mirrors to help clients identify the proper tongue placement when pronouncing a specific sound. 

Auditory Discrimination Training

It helps people improve their speech accuracy by distinguishing between the target sound and the sound produced.²

Home Practice

To help people put what they have learned in therapy into practice, home exercises and practices are assigned by the therapist. In this way, therapists also offer guidance to parents or caregivers.

Top Exercises for Overcoming Lisping

While speech therapy is required, there are several exercises that people with lisping can do at home to supplement their therapy sessions. Regular practice can strengthen muscle memory and improve speech clarity over time.

Tongue Strengthening Exercises

Strengthening the tongue muscles is essential for better speech articulation. Simple exercises, such as sticking out the tongue and holding it in various positions or moving a tongue depressor between the lips, help to build strength and control.

Another effective exercise is the "tongue twister" technique, in which people practice saying difficult phrases to improve their tongue dexterity and coordination.

Breathing and Relaxation Techniques

Proper breathing and relaxation techniques can also help to improve speech. Deep breathing exercises, as well as relaxation techniques like yawning or stretching the jaw, can help relieve tension and improve overall speech fluency.

Apart from these exercises, people who lisp can benefit from mindfulness practices like meditation. It can help them become more conscious of their speech patterns and work to correct them.

FAQs

At what age should a lisp be addressed? 

While some children may naturally outgrow a lisp, it's beneficial to seek assessment around age 4 or 5 if it persists, especially if it affects communication or self-esteem.

How does speech therapy help with lisps?  

Speech therapy provides targeted exercises to improve tongue placement, airflow, and overall articulation. Therapists create personalised plans to address the specific type of lisp and help clients develop clearer speech.

What can I expect during a speech therapy session? 

Sessions typically include assessments, articulation exercises, auditory discrimination activities, and practice in real-life scenarios. Feedback and encouragement are integral parts of the process.^2,3

How long does speech therapy take? 

The duration of therapy varies based on the individual's needs, the severity of the lisp, and the frequency of sessions. Some clients may see improvement in a few months, while others may require longer-term support.

Is speech therapy only for children? 

No, speech therapy is effective for individuals of all ages, including adults. Many adults seek therapy to improve their speech clarity and confidence.³

Can parents help at home? 

Parents can reinforce skills learned in therapy by practising sounds and words with their children, providing positive feedback, and encouraging communication in everyday situations.²

What qualifications should a speech therapist have? 

Look for a licensed speech-language pathologist (SLP) with experience in treating speech disorders, particularly lisps. They should hold relevant degrees and certifications.

Conclusion

Speech therapy for lisp is an effective intervention that helps individuals improve their speech clarity and confidence. Through tailored exercises and techniques, speech therapists address the underlying causes of lisping, enabling clients to articulate sounds correctly. Early intervention can lead to significant progress, enhancing communication skills and overall quality of life. With dedicated practice and professional guidance, those with a lisp can achieve successful outcomes and speak with greater fluency.