diff --git a/app/components/UI/ApproveTransactionReview/EditPermission/index.js b/app/components/UI/ApproveTransactionReview/EditPermission/index.tsx
similarity index 83%
rename from app/components/UI/ApproveTransactionReview/EditPermission/index.js
rename to app/components/UI/ApproveTransactionReview/EditPermission/index.tsx
index 72464018a73..c15c136e95a 100644
--- a/app/components/UI/ApproveTransactionReview/EditPermission/index.js
+++ b/app/components/UI/ApproveTransactionReview/EditPermission/index.tsx
@@ -1,18 +1,22 @@
-import React, { useCallback, useMemo, useState } from 'react';
-import PropTypes from 'prop-types';
-import { View, StyleSheet, TouchableOpacity, TextInput } from 'react-native';
+import React, { useCallback, useEffect, useState } from 'react';
+import {
+  View,
+  Text,
+  StyleSheet,
+  TouchableOpacity,
+  TextInput,
+} from 'react-native';
 import { fontStyles } from '../../../../styles/common';
-import Text from '../../../Base/Text';
 import StyledButton from '../../StyledButton';
 import { strings } from '../../../../../locales/i18n';
+import { isNumber } from '../../../../util/number';
 import ConnectHeader from '../../ConnectHeader';
 import Device from '../../../../util/device';
 import ErrorMessage from '../../../Views/SendFlow/ErrorMessage';
 import { useAppThemeFromContext, mockTheme } from '../../../../util/theme';
 import formatNumber from '../../../../util/formatNumber';
-import { INTEGER_OR_FLOAT_REGEX } from '../../../../util/number';
 
-const createStyles = (colors) =>
+const createStyles = (colors: any) =>
   StyleSheet.create({
     wrapper: {
       paddingHorizontal: 24,
@@ -99,6 +103,20 @@ const createStyles = (colors) =>
     },
   });
 
+interface IEditPermissionProps {
+  host: string;
+  minimumSpendLimit: string;
+  spendLimitUnlimitedSelected: boolean;
+  tokenSymbol: string;
+  spendLimitCustomValue: string;
+  originalApproveAmount: string;
+  onSetApprovalAmount: () => void;
+  onSpendLimitCustomValueChange: (approvalCustomValue: string) => void;
+  onPressSpendLimitUnlimitedSelected: () => void;
+  onPressSpendLimitCustomSelected: () => void;
+  toggleEditPermission: () => void;
+}
+
 function EditPermission({
   host,
   minimumSpendLimit,
@@ -111,21 +129,25 @@ function EditPermission({
   onPressSpendLimitUnlimitedSelected,
   onPressSpendLimitCustomSelected,
   toggleEditPermission,
-}) {
+}: IEditPermissionProps) {
   const [initialState] = useState({
     spendLimitUnlimitedSelected,
     spendLimitCustomValue,
   });
+  const [disableBtn, setDisableBtn] = useState(false);
+  const [displayErrorMsg, setDisplayErrorMsg] = useState(false);
   const { colors, themeAppearance } = useAppThemeFromContext() || mockTheme;
   const styles = createStyles(colors);
 
-  const displayErrorMessage = useMemo(
-    () =>
-      (!spendLimitUnlimitedSelected &&
-        !INTEGER_OR_FLOAT_REGEX.test(spendLimitCustomValue)) ||
-      Number(minimumSpendLimit) > spendLimitCustomValue,
-    [spendLimitUnlimitedSelected, spendLimitCustomValue, minimumSpendLimit],
-  );
+  useEffect(() => {
+    setDisplayErrorMsg(
+      Number(minimumSpendLimit) > Number(spendLimitCustomValue),
+    );
+  }, [minimumSpendLimit, spendLimitCustomValue, spendLimitUnlimitedSelected]);
+
+  useEffect(() => {
+    setDisableBtn(!isNumber(spendLimitCustomValue) || displayErrorMsg);
+  }, [spendLimitCustomValue, displayErrorMsg]);
 
   const onSetApprovalAmount = useCallback(() => {
     if (!spendLimitUnlimitedSelected && !spendLimitCustomValue) {
@@ -141,13 +163,12 @@ function EditPermission({
   ]);
 
   const onBackPress = useCallback(() => {
-    const { spendLimitUnlimitedSelected, spendLimitCustomValue } = initialState;
-    if (spendLimitUnlimitedSelected) {
+    if (initialState.spendLimitUnlimitedSelected) {
       onPressSpendLimitUnlimitedSelected();
     } else {
       onPressSpendLimitCustomSelected();
     }
-    onSpendLimitCustomValueChange(spendLimitCustomValue);
+    onSpendLimitCustomValueChange(initialState.spendLimitCustomValue);
     toggleEditPermission();
   }, [
     initialState,
@@ -249,7 +270,7 @@ function EditPermission({
               returnKeyType={'done'}
               keyboardAppearance={themeAppearance}
             />
-            {displayErrorMessage && (
+            {displayErrorMsg && (
               <View style={styles.errorMessageWrapper}>
                 <ErrorMessage
                   errorMessage={strings(
@@ -265,7 +286,7 @@ function EditPermission({
         </View>
       </View>
       <StyledButton
-        disabled={displayErrorMessage}
+        disabled={disableBtn}
         type="confirm"
         onPress={onSetApprovalAmount}
       >
@@ -275,18 +296,4 @@ function EditPermission({
   );
 }
 
-EditPermission.propTypes = {
-  host: PropTypes.string.isRequired,
-  minimumSpendLimit: PropTypes.string,
-  spendLimitUnlimitedSelected: PropTypes.bool.isRequired,
-  tokenSymbol: PropTypes.string.isRequired,
-  spendLimitCustomValue: PropTypes.string.isRequired,
-  originalApproveAmount: PropTypes.string.isRequired,
-  onPressSpendLimitUnlimitedSelected: PropTypes.func.isRequired,
-  onPressSpendLimitCustomSelected: PropTypes.func.isRequired,
-  onSpendLimitCustomValueChange: PropTypes.func.isRequired,
-  onSetApprovalAmount: PropTypes.func.isRequired,
-  toggleEditPermission: PropTypes.func.isRequired,
-};
-
 export default EditPermission;
diff --git a/app/components/UI/Swaps/components/ApprovalTransactionEditionModal.js b/app/components/UI/Swaps/components/ApprovalTransactionEditionModal.js
index a15c984ce90..0012a58a54e 100644
--- a/app/components/UI/Swaps/components/ApprovalTransactionEditionModal.js
+++ b/app/components/UI/Swaps/components/ApprovalTransactionEditionModal.js
@@ -37,6 +37,8 @@ function ApprovalTransactionEditionModal({
   chainId,
 }) {
   /* Approval transaction if any */
+  const [customApprovalTransaction, setCustomApprovalTransaction] =
+    useState(approvalTransaction);
   const [approvalTransactionAmount, setApprovalTransactionAmount] =
     useState('');
   const [approvalCustomValue, setApprovalCustomValue] =
@@ -49,10 +51,12 @@ function ApprovalTransactionEditionModal({
     (approvalCustomValue) => setApprovalCustomValue(approvalCustomValue),
     [],
   );
+
   const onPressSpendLimitUnlimitedSelected = useCallback(
     () => setSpendLimitUnlimitedSelected(true),
     [],
   );
+
   const onPressSpendLimitCustomSelected = useCallback(
     () => setSpendLimitUnlimitedSelected(false),
     [],
@@ -66,8 +70,9 @@ function ApprovalTransactionEditionModal({
           : approvalCustomValue,
         sourceToken.decimals,
         swapsUtils.getSwapsContractAddress(chainId),
-        approvalTransaction,
+        customApprovalTransaction,
       );
+      setCustomApprovalTransaction(newApprovalTransaction);
       setApprovalTransaction(newApprovalTransaction);
       onCancelEditQuoteTransactions();
     } catch (err) {
@@ -78,27 +83,32 @@ function ApprovalTransactionEditionModal({
     spendLimitUnlimitedSelected,
     approvalTransactionAmount,
     approvalCustomValue,
-    approvalTransaction,
+    customApprovalTransaction,
     sourceToken,
     chainId,
     onCancelEditQuoteTransactions,
   ]);
 
   useEffect(() => {
-    setApprovalTransaction(originalApprovalTransaction);
-    if (originalApprovalTransaction) {
+    const newApprovalTx = spendLimitUnlimitedSelected
+      ? originalApprovalTransaction
+      : customApprovalTransaction;
+    setApprovalTransaction(newApprovalTx);
+    if (newApprovalTx) {
       const approvalTransactionAmount = decodeApproveData(
-        originalApprovalTransaction.data,
+        newApprovalTx.data,
       ).encodedAmount;
       const amountDec = hexToBN(approvalTransactionAmount).toString(10);
       setApprovalTransactionAmount(
         fromTokenMinimalUnitString(amountDec, sourceToken.decimals),
       );
     }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [
     originalApprovalTransaction,
-    sourceToken.decimals,
     setApprovalTransaction,
+    spendLimitUnlimitedSelected,
+    customApprovalTransaction,
   ]);
 
   return (
@@ -120,7 +130,7 @@ function ApprovalTransactionEditionModal({
       <KeyboardAwareScrollView
         contentContainerStyle={styles.keyboardAwareWrapper}
       >
-        {Boolean(approvalTransaction) && (
+        {Boolean(customApprovalTransaction) && (
           <EditPermission
             host={'Swaps'}
             minimumSpendLimit={minimumSpendLimit}
diff --git a/app/util/number/index.js b/app/util/number/index.js
index c3f097fc15c..ec6ff260deb 100644
--- a/app/util/number/index.js
+++ b/app/util/number/index.js
@@ -353,6 +353,16 @@ export function toBN(value) {
   return new BN(value);
 }
 
+/**
+ * Determines if a string is a valid number
+ *
+ * @param {*} str - Number string
+ * @returns {boolean} - True if the string  is a valid number
+ */
+export function isNumber(str) {
+  return /^(\d+(\.\d+)?)$/.test(str);
+}
+
 /**
  * Converts some unit to wei
  *
diff --git a/app/util/number/index.test.ts b/app/util/number/index.test.ts
index 5f3e16ef2e7..13e461ce5ac 100644
--- a/app/util/number/index.test.ts
+++ b/app/util/number/index.test.ts
@@ -23,6 +23,7 @@ import {
   toHexadecimal,
   safeNumberToBN,
   fastSplit,
+  isNumber,
 } from '.';
 
 describe('Number utils :: BNToHex', () => {
@@ -489,3 +490,28 @@ describe('Number utils :: fastSplit', () => {
     expect(fastSplit('test string', ' ')).toEqual('test');
   });
 });
+
+describe('Number utils :: isNumber', () => {
+  it('should be a valid number ', () => {
+    expect(isNumber('1650.7')).toBe(true);
+    expect(isNumber('1000')).toBe(true);
+    expect(isNumber('0.0001')).toBe(true);
+    expect(isNumber('0001')).toBe(true);
+    expect(isNumber('1')).toBe(true);
+  });
+
+  it('should not be a valid number ', () => {
+    expect(isNumber('..7')).toBe(false);
+    expect(isNumber('1..1')).toBe(false);
+    expect(isNumber('0..')).toBe(false);
+    expect(isNumber('a.0001')).toBe(false);
+    expect(isNumber('00a01')).toBe(false);
+    expect(isNumber('1,.')).toBe(false);
+    expect(isNumber('1,')).toBe(false);
+    expect(isNumber('.')).toBe(false);
+    expect(isNumber('a¡1')).toBe(false);
+    expect(isNumber('.01')).toBe(false);
+    expect(isNumber(undefined)).toBe(false);
+    expect(isNumber(null)).toBe(false);
+  });
+});